Base on docker-playground.git's ttcn3-bts-test/*.cfg files, change IPs
from 172.18.9.* to 127.0.0.* (last octet unchanged).
Change-Id: I9eb2bb4599a4e874424f73483d9658a4467b8b8c
This introduces a set of CBCH related tests for osmo-bts.
Warning: Those tests currently require a patched trxcon to work.
Related: OS#4011
Change-Id: I955b4000c12180a39b0205b69b7b2c8cee8c9da3