Cleanup the public vs private ISCAPI remnants

Since all the libraries are internal now, just cleanup the ISCAPI remnants
in isc_socket, isc_task and isc_timer APIs.  This means, there's one less
layer as following changes have been done:

 * struct isc_socket and struct isc_socketmgr have been removed
 * struct isc__socket and struct isc__socketmgr have been renamed
   to struct isc_socket and struct isc_socketmgr
 * struct isc_task and struct isc_taskmgr have been removed
 * struct isc__task and struct isc__taskmgr have been renamed
   to struct isc_task and struct isc_taskmgr
 * struct isc_timer and struct isc_timermgr have been removed
 * struct isc__timer and struct isc__timermgr have been renamed
   to struct isc_timer and struct isc_timermgr
 * All the associated code that dealt with typing isc_<foo>
   to isc__<foo> and back has been removed.

(cherry picked from commit 16fe0d1f)
81 jobs for !4917 with ondrej/cleanup-ISCAPI-remnants-v9_16 in 28 minutes and 17 seconds (queued for 11 seconds)
latest detached
Status Job ID Name Coverage
  Precheck
passed #1649875
amd64 linux
autoreconf

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passed #1649877
amd64 linux
clang-format

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passed #1649878
amd64 linux
coccinelle

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passed #1650109
amd64 linux
danger

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passed #1649876
amd64 linux
misc

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failed #1649954
amd64 linux
danger

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failed #1649879
amd64 linux
danger

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  Build
passed #1649892
amd64 linux
clang:asan

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amd64 linux
clang:buster:amd64

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passed #1649899
amd64 libvirt
clang:freebsd11:amd64

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passed #1649900
amd64 libvirt
clang:freebsd12:amd64

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passed #1649901
amd64 libvirt
clang:openbsd:amd64

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passed #1649894
amd64 linux
clang:tsan

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passed #1649880
amd64 linux
gcc:alpine3.13:amd64

00:01:45

passed #1649891
amd64 linux
gcc:asan

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passed #1649884
amd64 linux
gcc:buster:amd64

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passed #1649881
amd64 linux
gcc:centos7:amd64

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passed #1649882
amd64 linux
gcc:centos8:amd64

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passed #1649890
amd64 linux
gcc:focal:amd64

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passed #1649895
amd64 linux
gcc:mutexatomics

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passed #1649886
amd64 linux
gcc:out-of-tree

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amd64 linux
gcc:sid:amd64

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passed #1649887
i386 linux
gcc:sid:i386

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passed #1649897
amd64 linux
gcc:softhsm2.4

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amd64 linux
gcc:softhsm2.6

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amd64 linux
gcc:stretch:amd64

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passed #1649893
amd64 linux
gcc:tsan

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passed #1649888
amd64 linux
gcc:tumbleweed:amd64

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passed #1649889
amd64 linux
gcc:xenial:amd64

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passed #1649903
amd64 windows
msvc:windows:amd64

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amd64 linux
nolibtool:sid:amd64

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  Unit
passed #1649915
amd64 linux
unit:clang:asan

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amd64 linux
unit:clang:buster:amd64

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amd64 libvirt
unit:clang:freebsd11:amd64

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amd64 libvirt
unit:clang:freebsd12:amd64

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passed #1649917
amd64 linux
unit:clang:tsan

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passed #1649904
amd64 linux
unit:gcc:alpine3.13:amd64

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amd64 linux
unit:gcc:asan

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passed #1649908
amd64 linux
unit:gcc:buster:amd64

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amd64 linux
unit:gcc:centos7:amd64

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passed #1649906
amd64 linux
unit:gcc:centos8:amd64

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passed #1649913
amd64 linux
unit:gcc:focal:amd64

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passed #1649918
amd64 linux
unit:gcc:mutexatomics

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passed #1649909
amd64 linux
unit:gcc:sid:amd64

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passed #1649910
i386 linux
unit:gcc:sid:i386

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passed #1649920
amd64 linux
unit:gcc:softhsm2.4

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passed #1649921
amd64 linux
unit:gcc:softhsm2.6

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passed #1649907
amd64 linux
unit:gcc:stretch:amd64

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passed #1649916
amd64 linux
unit:gcc:tsan

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passed #1649911
amd64 linux
unit:gcc:tumbleweed:amd64

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passed #1649912
amd64 linux
unit:gcc:xenial:amd64

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passed #1649924
amd64 linux
unit:nolibtool:sid:amd64

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  System
passed #1649936
amd64 linux
system:clang:asan

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passed #1649940
amd64 linux
system:clang:buster:amd64

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passed #1649943
amd64 libvirt
system:clang:freebsd11:amd64

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passed #1649944
amd64 libvirt
system:clang:freebsd12:amd64

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passed #1649938
amd64 linux
system:clang:tsan

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passed #1649925
amd64 linux
system:gcc:alpine3.13:amd64

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passed #1649935
amd64 linux
system:gcc:asan

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passed #1649929
amd64 linux
system:gcc:buster:amd64

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passed #1649926
amd64 linux
system:gcc:centos7:amd64

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passed #1649927
amd64 linux
system:gcc:centos8:amd64

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passed #1649934
amd64 linux
system:gcc:focal:amd64

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passed #1649939
amd64 linux
system:gcc:mutexatomics

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passed #1649930
amd64 linux
system:gcc:sid:amd64

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passed #1650373
i386 linux
system:gcc:sid:i386

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passed #1649941
amd64 linux
system:gcc:softhsm2.4

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amd64 linux
system:gcc:softhsm2.6

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passed #1649928
amd64 linux
system:gcc:stretch:amd64

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amd64 linux
system:gcc:tsan

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passed #1649932
amd64 linux
system:gcc:tumbleweed:amd64

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amd64 linux
system:gcc:xenial:amd64

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passed #1649945
amd64 linux
system:nolibtool:sid:amd64

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failed #1650196
i386 linux
system:gcc:sid:i386

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failed #1649931
i386 linux
system:gcc:sid:i386

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  Docs
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amd64 linux
docs

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  Postcheck
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amd64 linux
cppcheck

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amd64 linux
flake8

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passed #1649951
amd64 linux
gcov

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75.0%
passed #1649948
amd64 linux
pylint

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passed #1649949
amd64 linux
scan-build

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