Fix potential deadlock calling ast_call() with channel locks held.

Fixed app_queue.c:ring_entry() calling ast_call() with the channel locks
held.  Chan_local attempts to do deadlock avoidance in its ast_call()
callback and could deadlock if a channel lock is already held.
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Merged revisions 344539 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 344540 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@344541 65c4cc65-6c06-0410-ace0-fbb531ad65f3