Treat 405 responses the same way we would a 501.

This makes sure that we mark a method as being unallowed if we
receive a 405 response so that we don't continue to try to 
send that same type of message.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@197740 65c4cc65-6c06-0410-ace0-fbb531ad65f3