The self signed certificates created by OpenFire (Not sure if other
certs are affected as well) will crash the Java/Android TLS stack when
accessing getSubjectAlternativeNames() on the the peer certificate.
This usually goes unnoticed in other applications since the
DefaultHostnameVerifier checkes the CN first. That however is a
violation of RFC6125 section 6.4.4 which requires us to check for the
existence of SAN first.
This commit adds a work around where in self signed certificates we
check for the CN first as well. (Avoiding the call to
getSubjectAlternativeNames())
