libnetconf2 CI

VERSION bump to version 3.3.1 #363

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Run time

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Job	Run time
Get git branch	1s
Release, gcc, OpenSSL	1m 33s
Release, gcc, MbedTLS	1m 57s
Release, clang	1m 34s
Debug, gcc, OpenSSL	2m 55s
Debug, gcc, MbedTLS	3m 31s
Debug, clang	1m 22s
No SSH nor TLS	1m 38s
ASAN and UBSAN, OpenSSL	2m 3s
ASAN and UBSAN, MbedTLS	2m 0s
ABI Check	1m 27s
	20m 1s