bts: Add testscase & infra to validate Osmux support BTS<->BSC

Related: SYS#5987
Change-Id: I1af23c7a60b05edc3b544f1fea0023f48e89f7a7
diff --git a/bts/osmo-bts.cfg b/bts/osmo-bts.cfg
index f581be0..2eb84ff 100644
--- a/bts/osmo-bts.cfg
+++ b/bts/osmo-bts.cfg
@@ -24,7 +24,9 @@
  logging level dsp info
  logging level pcu debug
  logging level trx info
+ logging level osmux info
  logging level lmib debug
+ logging level lmux info
 !
 line vty
  no login
@@ -60,6 +62,10 @@
  min-qual-norm -5
  !settsc
  pcu-socket /tmp/pcu_sock
+ osmux
+  use on
+  local-ip 127.0.0.1
+  local-port 1984
  trx 0
   power-ramp max-initial 0 mdBm
   power-ramp step-size 8000 mdB