Removes counting participants and scheduling invite timeout.
Removes counting participants and scheduling invite timeout.

This counting is misleading as if someone leaves we schedule timeout but
 before receiving a session-terminate someone joins, as we had already
 received session-initiate we will not cancel that invite timeout we
 created and the participant will be dropped after some time. We leave
 the logic to Jicofo for sending us session-terminate when needed.

jitsi/jigasi,jitsi/jigasi