libnetconf2 CI

VERSION bump to version 3.5.3 #437

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Run time

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Job	Run time
Get git branch	1s
Release, gcc, OpenSSL	1m 38s
Release, gcc, MbedTLS	2m 7s
Release, clang	1m 41s
Debug, gcc, OpenSSL	3m 12s
Debug, gcc, MbedTLS	3m 47s
Debug, clang	1m 42s
No SSH nor TLS	1m 14s
ASAN and UBSAN, OpenSSL	1m 51s
ASAN and UBSAN, MbedTLS	2m 12s
ABI Check	1m 35s
DEB Package	3m 2s
	24m 2s