Merge changes I53ffe442,Ic0750bdc,Ic5499a0b,I67343f01

* changes:
  bsc: Run three virtual BTSs (2 in one lac, 1 in another)
  Add RTP_Emulation (stream source/sink) on top of RTP_CodecPort
  Add missing RTP_CodecPort_CtrlFunct TTCN and C++ files
  move RTP_CodecPort.ttcn to library