Commit
12c37168edc5017445302ff2e3d0e96f3681b01c
by Pau Espin Pedrolbts-oml: Set mp_pcu_socket
Since recently (osmo-ttcn3-hacks.git
I78880098a55d1cb456011746efa0a47832a86ca8), BTS_Tests_OML use
mp_pcu_socket to set up PCUIF, which is used in some tests (like
validating forwarding of PCUIF messages PCU<->BSC).
Related: SYS#5303
Change-Id: Iac4aac8d98e2f45021858ddaa5e20ca4c6effb31