Associate unit test data dir with a more specific variable

Having 'TESTS', the Automake variable and 'TESTS' the unit test data dir
seems confusing, lets rename the latter to to 'TESTS_DIR'.
83 jobs for !3655 with 1726-unit-tests-rename-tests-to-something-more-descriptive-v9_16 in 14 minutes and 46 seconds (queued for 8 seconds)
detached
Status Job ID Name Coverage
  Precheck
passed #931709
amd64 linux
autoreconf

00:01:34

passed #931711
amd64 linux
clang-format

00:01:27

passed #931712
amd64 linux
coccinelle

00:05:45

canceled #932044
linux amd64
danger

passed #931710
amd64 linux
misc

00:01:28

failed #931713
amd64 linux
danger

00:01:09

 
  Build
canceled #931729
amd64 linux
clang:asan

00:03:59

canceled #931733
amd64 linux
clang:buster:amd64

00:03:18

passed #931735
amd64 libvirt
clang:freebsd11.3:amd64

00:02:38

passed #931736
amd64 libvirt
clang:freebsd12.1:amd64

00:02:31

passed #931737
amd64 libvirt
clang:openbsd6.6:amd64

00:06:28

canceled #931731
amd64 linux
clang:tsan

00:03:29

passed #931714
amd64 linux
gcc:alpine3.11:amd64

00:03:44

canceled #931728
amd64 linux
gcc:asan

00:04:30

passed #931727
amd64 linux
gcc:bionic:amd64

00:03:21

passed #931719
amd64 linux
gcc:buster:amd64

00:03:14

passed #931715
amd64 linux
gcc:centos6:amd64

00:03:18

passed #931716
amd64 linux
gcc:centos7:amd64

00:02:58

passed #931717
amd64 linux
gcc:centos8:amd64

00:03:19

passed #931725
amd64 linux
gcc:fedora31:amd64

00:03:13

passed #931732
amd64 linux
gcc:mutexatomics

00:03:12

passed #931721
amd64 linux
gcc:out-of-tree

00:04:07

passed #931734
amd64 linux
gcc:pkcs11

00:03:06

passed #931720
amd64 linux
gcc:sid:amd64

00:04:18

passed #931722
arm64 linux
gcc:sid:arm64

00:03:29

passed #931723
i386 linux
gcc:sid:i386

00:03:18

passed #931718
amd64 linux
gcc:stretch:amd64

00:03:43

passed #931730
amd64 linux
gcc:tsan

00:03:32

passed #931724
amd64 linux
gcc:tumbleweed:amd64

00:03:11

passed #931726
amd64 linux
gcc:xenial:amd64

00:05:17

passed #931739
amd64 windows
msvc:windows:amd64

00:02:38

canceled #931738
amd64 linux
nolibtool:sid:amd64

00:02:44

 
  Unit
canceled #931754
amd64 linux
unit:clang:asan

canceled #931758
amd64 linux
unit:clang:buster:amd64

passed #931760
amd64 libvirt
unit:clang:freebsd11.3:amd64

00:01:29

passed #931761
amd64 libvirt
unit:clang:freebsd12.1:amd64

00:01:17

canceled #931756
amd64 linux allowed to fail
unit:clang:tsan

canceled #931740
amd64 linux
unit:gcc:alpine3.11:amd64

00:01:50

canceled #931753
amd64 linux
unit:gcc:asan

canceled #931752
amd64 linux
unit:gcc:bionic:amd64

canceled #931745
amd64 linux
unit:gcc:buster:amd64

00:00:02

canceled #931741
amd64 linux
unit:gcc:centos6:amd64

00:01:16

canceled #931742
amd64 linux
unit:gcc:centos7:amd64

00:00:30

canceled #931743
amd64 linux
unit:gcc:centos8:amd64

00:00:23

canceled #931750
amd64 linux
unit:gcc:fedora31:amd64

canceled #931757
amd64 linux
unit:gcc:mutexatomics

canceled #931759
amd64 linux
unit:gcc:pkcs11

canceled #931746
amd64 linux
unit:gcc:sid:amd64

00:00:01

passed #931747
arm64 linux
unit:gcc:sid:arm64

00:00:57

canceled #931748
i386 linux
unit:gcc:sid:i386

canceled #931744
amd64 linux
unit:gcc:stretch:amd64

00:00:09

canceled #931755
amd64 linux allowed to fail
unit:gcc:tsan

canceled #931749
amd64 linux
unit:gcc:tumbleweed:amd64

canceled #931751
amd64 linux
unit:gcc:xenial:amd64

canceled #931762
amd64 linux
unit:nolibtool:sid:amd64

 
  System
canceled #931777
amd64 linux
system:clang:asan

canceled #931781
amd64 linux
system:clang:buster:amd64

canceled #931783
amd64 libvirt
system:clang:freebsd11.3:amd64

canceled #931784
amd64 libvirt
system:clang:freebsd12.1:amd64

canceled #931779
amd64 linux allowed to fail
system:clang:tsan

canceled #931763
amd64 linux
system:gcc:alpine3.11:amd64

canceled #931776
amd64 linux
system:gcc:asan

canceled #931775
amd64 linux
system:gcc:bionic:amd64

canceled #931768
amd64 linux
system:gcc:buster:amd64

canceled #931764
amd64 linux
system:gcc:centos6:amd64

canceled #931765
amd64 linux
system:gcc:centos7:amd64

canceled #931766
amd64 linux
system:gcc:centos8:amd64

canceled #931773
amd64 linux
system:gcc:fedora31:amd64

canceled #931780
amd64 linux
system:gcc:mutexatomics

canceled #931782
amd64 linux
system:gcc:pkcs11

canceled #931769
amd64 linux
system:gcc:sid:amd64

canceled #931770
arm64 linux
system:gcc:sid:arm64

canceled #931771
i386 linux
system:gcc:sid:i386

canceled #931767
amd64 linux
system:gcc:stretch:amd64

canceled #931778
amd64 linux allowed to fail
system:gcc:tsan

canceled #931772
amd64 linux
system:gcc:tumbleweed:amd64

canceled #931774
amd64 linux
system:gcc:xenial:amd64

canceled #931785
amd64 linux
system:nolibtool:sid:amd64

 
  Docs
canceled #931786
amd64 linux
docs

 
  Postcheck
canceled #931790
amd64 linux
cppcheck

canceled #931787
amd64 linux
flake8

canceled #931788
amd64 linux
pylint

canceled #931789
amd64 linux
scan-build