app_confbridge: file playback blocks dtmf

Attempting to execute DTMF in a confbridge while file playback (prompt,
announcement, etc) is occurring is not allowed. You have to wait until
the sound file has completed before entering DTMF. This patch fixes it
so that app_confbridge now monitors for dtmf key presses during menu
driven file playback. If a key is pressed playback stops and it executes
the matched menu option.

ASTERISK-24864 #close
Reported by: Steve Pitts
Review: https://reviewboard.asterisk.org/r/4477/


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@433445 65c4cc65-6c06-0410-ace0-fbb531ad65f3