In Air-Gapped or otherwise network-restricted environments,
TcpStream::connect can spuriously fail due to name resolution
failure, or just in establishing the socket itself.
In this situation, the test can't give a meaningful result, and this
failure doesn't indicate a problem in the OpenSSL stack.
Bug: https://github.com/sfackler/rust-openssl/issues/1215
The session context is used for session callbacks rather than the normal
context, which breaks state lookup when the context has been swapped out
(e.g. for SNI). Since there isn't an accessor for the session context,
we just store an extra reference in the SSL's ex data.
Closes#1115
Ivan Nikulin