app_dial optional parameter to option 'r' to allow play indication from indications.conf

  (closes issue #14504)
  Reported by: alecdavis
  Tested by: alecdavis,jsmith
  Patch
	 app_dial.play_ring_indications.diff7.txt uploaded by alecdavis (license 585)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@235740 65c4cc65-6c06-0410-ace0-fbb531ad65f3