Changes

pcu_sock: do not receive a TXT ind. with PCU_VERSION for a specific BTS

We receive a TXT indication that contains the PCU_VERSION from the PCU when the
connection to the PCU is established. This message contains a BTS number, which
is always 0. This is a hard coded value that does not refer to a specific BTS
object. Also it is not logical to inform a specific BTS object about the PCU
version. This information should be directed to the connecting process as a
whole. However, we use this TXT indication to trigger certain initialization
processes on the BTS object we manage inside the BSC process. Unfortunately the
BSC is currently using the BTS Number in the TXT indication to resolve the BTS
object. This is not correct, instead the BSC should iterate of over all BTS
objects and trigger the initializations for each BTS object that has a BSC
co-located PCU.

This change does not have any dependencies, it just corrects the behavior of
the BSC on initialization.

Related: OS#6507
Change-Id: I3fbf5430db8b8ea29efb147bd162706990453fc5