Configure each osmo-* program to send GSMTAP log output to the IP of the
docker container, which runs the testsuite (and therefore runs tcpdump).
Related: https://lists.osmocom.org/pipermail/openbsc/2019-June/012946.html
Change-Id: I99e74f6ffb5b7d566cec35995bf067df414968d8
This will enable us to run the PCU testsuite automatically by
jenkins, just like for other Osmocom projects.
Change-Id: Ia8e2ed2e7d03b8afdc7b1e068f94b0544a8112c7
Related: OS#2890