Add/drop bye packets (#716)
Add/drop bye packets (#716)

* Drop bye packets in RtcpForwarder

lynckia/licode,yangjinecho/licode,yangjinecho/licode,yangjinecho/licode,lynckia/licode,MModal/licode,yangjinecho/licode,lodoyun/licode,lodoyun/licode,yangjinecho/licode,MModal/licode,lodoyun/licode,yangjinecho/licode,lodoyun/licode,MModal/licode,MModal/licode,lodoyun/licode,jcague/licode,jcague/licode,lodoyun/licode,yangjinecho/licode,lynckia/licode,lynckia/licode,yangjinecho/licode,jcague/licode,MModal/licode,MModal/licode,jcague/licode,lynckia/licode,jcague/licode,jcague/licode,MModal/licode,jcague/licode,lynckia/licode,lynckia/licode,lodoyun/licode