Matthew Waters authored May 05, 2020 and GStreamer Marge Bot committed May 06, 2020

When negotiating the SDP we should only connect the streams that are
actually mentioned in the SDP.  All other streams are not relevant at
this time and would likely be part of a future SDP update.  Fixes a
couple of the renegotiation webrtc unit tests.

Part-of: <!1240>