Skip test_cert_info tls unit test on pyOpenSSL upstream errors
Skip test_cert_info tls unit test on pyOpenSSL upstream errors

The 16.0.0 version of pyOpenSSL has an upstream error in it that
causes a stacktrace in our test suite. The upstream issue has
been fixed in pyOpenSSL in 16.1.0 and upwards, but 16.0.0 is still
available.

This fix skips the test when the specific error generated by the
upstream bug is encountered during the test.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt