Change-Id: If73aa453e44ebf28032c60d207feb03e8061dc0c
this includes a GTPv2_CodecPort (for the usual transcoding) as wella as an empty GTPv2_PrivateExtensions.ttcn without which the TITAN GTPv2 ProtocolModule won't compile. Change-Id: I1c1b8409077103dd4e64e467d21d33d8c9c4ac95