Remove DNS lookup from sip_devicestate. This seems to come from way back when...

Remove DNS lookup from sip_devicestate. This seems to come from way back when and I can't think of a reason for it being here, plus it could cause needless DNS lookups.
(closes issue #10983)
Reported by: jtodd


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@98954 65c4cc65-6c06-0410-ace0-fbb531ad65f3