OpenSSL TLS contexts assume ownership of any additional certificate passed into it. The CertificateFactory now returns a vector of unique_ptrs, and OpenSSLContext will do the needful with releasing ownership at the right moment. A unit test has been added that uses a chained certificate in client/server context. Before the fix, this test would either fail, or result in a segmentation fault, depending on the mood of OpenSSL. Test-Information: Unit tests pass on Debian 9 Ran manual tests with server test code, tested both chained and single certificates, and no longer observed crashes when accepting a connection. Change-Id: I21814969e45c7d77e9a1af14f2c958c4c0311cd0