Merged revisions 160003 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r160003 | russell | 2008-12-01 11:27:30 -0600 (Mon, 01 Dec 2008) | 6 lines

Apply some logic used in iax2_indicate() to iax2_setoption(), as well, since they
both have the potential to send control frames in the middle of call setup.  We
have to wait until we have received a message back from the remote end before
we try to send any more frames.  Otherwise, the remote end will consider it
invalid, and we'll get stuck in an INVAL/VNAK storm.

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@160004 65c4cc65-6c06-0410-ace0-fbb531ad65f3