Fix parallel execution of the testsuite

[coldtobi]

As many of the individual testsuite uses the same output file for the artifacts
of the test suites, the tests are racy if executed in parallel, eg. by ctest
-jxx. This patch fixes it by assigning individual names for the test artifact
files.

Jira-Issue: LOGCXX-538

[coldtobi]

I need to investigate why the test suite failed. Will reopen PR once ready.

[coldtobi]

(Closing nuked the ci logs .... Reopening to get them again....)

[ams-tschoening]

Looks like you have simply missed to change src/test/resources/input/patternLayout13.properties? I find all the other files changed, but not this one.

[coldtobi]

Looks like you have simply missed to change src/test/resources/input/patternLayout13.properties? I find all the other files changed, but not this one.

Good catch! Thanks!

[coldtobi]

The failing testcase on ubuntu-18.04-g++-build-and-test is likely LOGCXX-322
2021-12-11T15:44:14.6741094Z 20 - multithreadtest (SEGFAULT)

(I've commented on LOGCXX-322 earlier today)

[coldtobi]

@ams-tschoening do you want to take another look or did I miss an open point? (dead lock avoidance)

[ams-tschoening]

Things look fine for me and running tests on my system still works. Regarding the segfault, let's just ignore it for now as part of this PR and merge?

Besides that, propertiestestcase is changed here and in PR #85, resulting in a conflict most likely. Any preference about which one to merge first? I would simply do this one and adopt the other PR.

[coldtobi]

I've got no preferences about the merge order, so just do as you see fit. thanks foor looking into it!