Fix *8 directed pickup locks system during pickupsound play out

Fix *8 directed pickup locks system during pickupsound play out

move playout from sip_pickup_thread to bridge using BRIDGE_PLAY_SOUND method,
This stop the clash of 2 threads trying to write audio to same channel.
In addition fixes choppy audio beep in issue 19177.

 (issue #18654)
 (issue #19177)
 Reported by: Docent
 Patches:
      review1232-1.88888888 alecdavis (license 585)
 Tested by: alecdavis

Review: https://reviewboard.asterisk.org/r/1232/

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@321211 65c4cc65-6c06-0410-ace0-fbb531ad65f3