Merge branch 'record-and-playback-feature' of github.com:bigbluebutton/bigbluebutton into record-and-playback-feature

 - send two of the remaining 3 packets at the same time to minimize choppy audio if we just dropped the 3 extra packets

- Don't check for symbolic link for /etc/nginx/sites-enabled/bigbluebutton if running on the Intalio VM

   is network congestion

   that way the RTMPProtocolEncoder can filter packets and start dropping those
   that have been in the queue for long

 - drop audio bytes if it grown larger than 1000

Conflicts:
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/red5/media/SipToFlashAudioStream.java

Stopped voice stream from client.  Now when the headset button is clicked the stream is properly terminated. (Fixes another server side threading issue)

Added posioning support the the audioByteData class and check to see if a posioned packet has been added to the queue.  If so then stop consuming packets from the queue.  This fixes the left over audio threads.

 - increase delay check time as we notice we are dropping too many packets when Asterisk/FreeSWITCH is on a different server

 - add logging when FS/Asterisk is the one telling us to hangup (e.g. being kicked from the conference)