make 'goto' APIs aware of auto-processing loops, so they know exactly when to...

make 'goto' APIs aware of auto-processing loops, so they know exactly when to set the requested priority or one priority lower


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5529 65c4cc65-6c06-0410-ace0-fbb531ad65f3