Don't treat a host lookup as failed if sipregs is not in use when doing a...

Don't treat a host lookup as failed if sipregs is not in use when doing a realtime lookup. (issue #9255 reported by sergee)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@61618 65c4cc65-6c06-0410-ace0-fbb531ad65f3