libnetconf2 CI

session server REFACTOR clean unix accept #357

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Run time

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Job	Run time
Get git branch	1s
Release, gcc, OpenSSL	1m 19s
Release, gcc, MbedTLS	1m 47s
Release, clang	1m 28s
Debug, gcc, OpenSSL	3m 12s
Debug, gcc, MbedTLS	3m 31s
Debug, clang	1m 26s
No SSH nor TLS	1m 49s
ASAN and UBSAN, OpenSSL	1m 29s
ASAN and UBSAN, MbedTLS	1m 58s
ABI Check	1m 39s
	19m 39s