libnetconf2 CI

VERSION bump to version 3.5.7 #459

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Run time

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Job	Run time
Get git branch	1s
Release, gcc, OpenSSL	1m 42s
Release, gcc, MbedTLS	2m 8s
Release, clang	1m 51s
Debug, gcc, OpenSSL	3m 31s
Debug, gcc, MbedTLS	3m 46s
Debug, clang	1m 42s
No SSH nor TLS	1m 19s
ASAN and UBSAN, OpenSSL	1m 49s
ASAN and UBSAN, MbedTLS	2m 18s
ABI Check	1m 49s
DEB Package	3m 51s
	25m 47s