Make app_queue and res_agi independent of AMI being enabled.
The https://reviewboard.asterisk.org/r/2888/ review changes manager to not
subscribe to stasis when it is disabled for performance reasons. When
manager is disabled app_queue and res_agi decline to load and fail to
clean up what they have already allocated.
* Made app_queue and res_agi clean up allocated resources when they
decline to load.
* Made app_queue and res_agi use their own subscriptions to the stasis
topics instead of borrowing manager's message router structure
inappropriately.
(closes issue ASTERISK-22604)
Reported by: rmudgett
Review: https://reviewboard.asterisk.org/r/2902/
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Merged revisions 400671 from http://svn.asterisk.org/svn/asterisk/branches/12
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@400672
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