Indicate to the kernel, that we won't be needing the zone dumps

Add a call to posix_fadvise() to indicate to the kernel, that `named`
won't be needing the dumped zone files any time soon with:

 * POSIX_FADV_DONTNEED - The specified data will not be accessed in the
   near future.

Notes:

 POSIX_FADV_DONTNEED attempts to free cached pages associated with the
 specified region. This is useful, for example, while streaming large
 files. A program may periodically request the kernel to free cached
 data that has already been used, so that more useful cached pages are
 not discarded instead.
74 jobs for !5105 with ondrej/rewrite-masterdump-to-uv-threadpool in 6 minutes and 56 seconds (queued for 9 seconds)
latest detached
Status Job ID Name Coverage
  Autoconf
passed #1754114
amd64 linux
autoreconf

00:00:20

 
  Precheck
passed #1754116
amd64 linux
clang-format

00:00:18

passed #1754117
amd64 linux
coccinelle

00:04:03

failed #1754118
amd64 linux
danger

00:00:23

failed #1754115
amd64 linux
misc

00:00:12

passed #1754119
amd64 linux
tarball-create

00:01:32

 
  Build
passed #1754132
amd64 linux
clang:asan

00:01:57

passed #1754136
amd64 linux
clang:buster:amd64

00:00:58

passed #1754139
amd64 libvirt
clang:freebsd12:amd64

00:01:07

passed #1754140
amd64 libvirt
clang:freebsd13:amd64

00:03:07

passed #1754141
amd64 libvirt
clang:openbsd:amd64

00:02:08

passed #1754134
amd64 linux
clang:tsan

00:01:09

passed #1754120
amd64 linux
gcc:alpine3.13:amd64

00:00:56

passed #1754131
amd64 linux
gcc:asan

00:01:37

failed #1754129
amd64 linux
gcc:bionic:amd64

00:00:50

passed #1754124
amd64 linux
gcc:buster:amd64

00:00:49

passed #1754121
amd64 linux
gcc:centos7:amd64

00:00:53

passed #1754122
amd64 linux
gcc:centos8:amd64

00:00:53

passed #1754130
amd64 linux
gcc:focal:amd64

00:00:51

passed #1754135
amd64 linux
gcc:mutexatomics

00:00:54

passed #1754126
amd64 linux
gcc:out-of-tree

00:00:53

failed #1754125
amd64 linux
gcc:sid:amd64

00:00:51

passed #1754137
amd64 linux
gcc:softhsm2.4

00:00:59

failed #1754138
amd64 linux
gcc:softhsm2.6

00:00:55

failed #1754123
amd64 linux
gcc:stretch:amd64

00:00:48

passed #1754127
amd64 linux
gcc:tarball

00:01:02

passed #1754133
amd64 linux
gcc:tsan

00:01:04

failed #1754128
amd64 linux
gcc:tumbleweed:amd64

00:00:49

failed #1754142
amd64 windows
msvc:windows:amd64

00:00:33

 
  Unit
canceled #1754153
amd64 linux
unit:clang:asan

00:01:24

passed #1754157
amd64 linux
unit:clang:buster:amd64

00:01:23

passed #1754160
amd64 libvirt
unit:clang:freebsd12:amd64

00:02:01

canceled #1754161
amd64 libvirt
unit:clang:freebsd13:amd64

00:02:56

canceled #1754162
amd64 libvirt
unit:clang:openbsd:amd64

00:02:58

canceled #1754155
amd64 linux
unit:clang:tsan

00:02:50

failed #1754143
amd64 linux
unit:gcc:alpine3.13:amd64

00:01:29

canceled #1754152
amd64 linux
unit:gcc:asan

00:01:41

skipped #1754150
amd64 linux
unit:gcc:bionic:amd64
passed #1754147
amd64 linux
unit:gcc:buster:amd64

00:02:24

passed #1754144
amd64 linux
unit:gcc:centos7:amd64

00:01:20

passed #1754145
amd64 linux
unit:gcc:centos8:amd64

00:01:21

passed #1754151
amd64 linux
unit:gcc:focal:amd64

00:01:25

passed #1754156
amd64 linux
unit:gcc:mutexatomics

00:01:25

skipped #1754148
amd64 linux
unit:gcc:sid:amd64
passed #1754158
amd64 linux
unit:gcc:softhsm2.4

00:01:19

skipped #1754159
amd64 linux
unit:gcc:softhsm2.6
skipped #1754146
amd64 linux
unit:gcc:stretch:amd64
canceled #1754154
amd64 linux
unit:gcc:tsan

00:01:46

skipped #1754149
amd64 linux
unit:gcc:tumbleweed:amd64
 
  System
canceled #1754173
amd64 linux
system:clang:asan

00:00:41

canceled #1754177
amd64 linux
system:clang:buster:amd64

canceled #1754180
amd64 libvirt
system:clang:freebsd12:amd64

00:04:59

canceled #1754181
amd64 libvirt
system:clang:freebsd13:amd64

00:02:52

canceled #1754175
amd64 linux
system:clang:tsan

00:00:13

canceled #1754163
amd64 linux
system:gcc:alpine3.13:amd64

00:01:34

canceled #1754172
amd64 linux
system:gcc:asan

00:00:47

skipped #1754170
amd64 linux
system:gcc:bionic:amd64
canceled #1754167
amd64 linux
system:gcc:buster:amd64

00:00:28

canceled #1754164
amd64 linux
system:gcc:centos7:amd64

00:01:25

canceled #1754165
amd64 linux
system:gcc:centos8:amd64

00:01:11

canceled #1754171
amd64 linux
system:gcc:focal:amd64

00:00:49

canceled #1754176
amd64 linux
system:gcc:mutexatomics

skipped #1754168
amd64 linux
system:gcc:sid:amd64
canceled #1754178
amd64 linux
system:gcc:softhsm2.4

skipped #1754179
amd64 linux
system:gcc:softhsm2.6
skipped #1754166
amd64 linux
system:gcc:stretch:amd64
canceled #1754174
amd64 linux
system:gcc:tsan

00:00:19

skipped #1754169
amd64 linux
system:gcc:tumbleweed:amd64
 
  Docs
canceled #1754182
amd64 linux
docs

 
  Postcheck
canceled #1754186
amd64 linux
cppcheck

canceled #1754183
amd64 linux
flake8

canceled #1754187
amd64 linux
gcov

canceled #1754184
amd64 linux
pylint

canceled #1754185
amd64 linux
scan-build

 
Name Stage Failure
failed
unit:gcc:alpine3.13:amd64 Unit
No job log
failed
gcc:bionic:amd64 Build
No job log
failed
gcc:sid:amd64 Build
No job log
failed
gcc:tumbleweed:amd64 Build
No job log
failed
gcc:stretch:amd64 Build
No job log
failed
gcc:softhsm2.6 Build
No job log
failed
msvc:windows:amd64 Build
No job log
failed
danger Precheck
No job log
failed
misc Precheck
No job log