When transmitting a register set the socket port to the local one for the...

When transmitting a register set the socket port to the local one for the transport being used, not the port for the remote server.
(closes issue #13633)
Reported by: performer


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@162619 65c4cc65-6c06-0410-ace0-fbb531ad65f3