Calling GENERAL_NAMES_free in _subjectAltNameString member method of X509Extenion method to avoid memory leaks.fixes https://github.com/pyca/pyopenssl/issues/139
Calling GENERAL_NAMES_free in _subjectAltNameString member method of X509Extenion method to avoid memory leaks.fixes https://github.com/pyca/pyopenssl/issues/139

rackerlabs/pyopenssl,rackerlabs/pyopenssl