netopeer2 CI

tests BUGFIX try to prevent multi-threading problems #612

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Job	Run time
Get git branch	1s
Release, gcc	1m 33s
Release, clang	1m 41s
Debug, gcc, with URL	3m 23s
Debug, clang	1m 9s
ASAN and UBSAN	1m 41s
DEB Package	4m 27s
	13m 55s