This is something we need to simulate more complex scenarios,
particularly in the context of frame relay.
Change-Id: If1220852785853f8a5d8de183d5053ddd6ccb958
Add frame relay testcase for BSS and SGSN side.
The test cases require hdlc interfaces (based on
dadhi with super channels and no lmi).
Change-Id: I95d64dc26a8d2ff02d6cf2bfcd22a97e5481f957