Print out the channel name as a prefix to the "agi debug" output. This makes

AGI debugging on busy systems much easier.

(closes issue #10730)
Reported by: junky
Patches: 
      agi_debug_chan.diff uploaded by junky (license 177)
	  20070923_10730.diff uploaded by mvanbaak (license 7)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89074 65c4cc65-6c06-0410-ace0-fbb531ad65f3