When we receive no response at all to our INVITE, allow the channel to be destroyed.

When we receive no response at all to our INVITE, allow the channel to be destroyed.
(closes issue #15627)
 Reported by: falves11
 Patches:
       20091209__issue15627__1.6.0.diff.txt uploaded by tilghman (license 14)
       20091209__issue15627__1.4.diff.txt uploaded by tilghman (license 14)
 Tested by: falves11
Review: https://reviewboard.asterisk.org/r/446/
(closes issue #15716)
Reported by: dant
(closes issue #16270)
Reported by: corruptor
(closes issue #15356)
Reported by: falves11
(issue #16382)
Reported by: lftsy

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@234095 65c4cc65-6c06-0410-ace0-fbb531ad65f3