mgmt: Making use of standard appendVersion/appendSegment calls

Change-Id: I41bde564f276c089ce55de8824c07a790d9f9164
face: Implementing forgotten isListening() feature in TcpChannel

Change-Id: Idfcd8337d16b414d2f739f936660dffdce413729
mgmt: Inserting created multicast faces into the forwarder (FaceTable)

Change-Id: I124c9a96c5c82b29deca5492d34fdf90d7ff0353
Refs: #1394