LCLS: add bts-loop variant

Add LCLS variant where the loop is closed on BTS level instead of
MGW. The main difference is the handling of connection-related
messages (we use IPA RSL instead of MGCP), the configuration and
correlation logic remains the same.

Change-Id: I7e8379f31037f2c48da69a01919701919a3066a2
Related: OS#3659
4 files changed