Register request line contains wrong address when user domain and register host differ

(closes issue #15539)
Reported by: Nick_Lewis
Patches:
      chan_sip.c-registraraddr.patch uploaded by Nick (license 657)
      register_domain_fix_1.6.2 uploaded by dvossel (license 671)
Tested by: Nick_Lewis, dvossel



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@213716 65c4cc65-6c06-0410-ace0-fbb531ad65f3