Don't do a DNS lookup on an outbound REGISTER host if there is an outbound proxy configured.

(closes issue ASTERISK-16550)
reported by: Olle Johansson
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Merged revisions 352424 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 352430 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@352431 65c4cc65-6c06-0410-ace0-fbb531ad65f3