Clear the autoloop flag when parsing and setting the...

Clear the autoloop flag when parsing and setting the context/extension/priority to go back to. When the channel executes a PBX again we want it to start out at the point we explicitly say and at that point it will not yet be doing autoloop.
(closes issue #14304)
Reported by: jcovert


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@170047 65c4cc65-6c06-0410-ace0-fbb531ad65f3