Make it possible to autopause on a busy or unavailable response from
a device.

(closes issue ASTERISK-16112)
Reported by: jlpedrosa
Patches:
	autopausebusy.txt by twilson

Review: https://reviewboard.asterisk.org/r/1399/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@338187 65c4cc65-6c06-0410-ace0-fbb531ad65f3