Add 'o' option to Chanspy which causes it to only listen to audio coming from the channel, and the 'X' option which allows the user to exit to a valid single digit extension. (issue #8137 reported by mnicholson)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@54748 65c4cc65-6c06-0410-ace0-fbb531ad65f3