TLS Configuration does not support TLSv1_3 in OpenSSL v1.1.1

OpenSSL 1.1.1 adds protocol version TLSv1_3. The current config interface has no way to enable or disable that version. This was predicted in PROTON-1670.

The ssl self test tests the customer interface nicely but does not test that the requested TLS versions used by the domain are enforced or not. Qpid-dispatch has a self test that exercises actual connections https://github.com/apache/qpid-dispatch/blob/master/tests/system_tests_ssl.py and it is failing with OpenSSL v1.1.1.