Restore 'asyncagi break' command to 1.6.1 and higher.

(closes issue #14985)
 Reported by: nikkk
 Patches: 
       20090428__bug14985.diff.txt uploaded by tilghman (license 14)
       20090429__bug14985__1.6.1.diff.txt uploaded by tilghman (license 14)
 Tested by: nikkk


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@192171 65c4cc65-6c06-0410-ace0-fbb531ad65f3