drop files unrelated to osmo-mgw

These either remain from openbsc.git or slipped in while applying recent
patches from openbsc.git and do not belong in osmo-mgw.

The ctrl_test_runner.py from openbsc.git still sticks around, but osmo-bsc_mgcp
has no CTRL interface (yet). If it gets one, we can re-add the
ctrl_test_runner.

Change-Id: I623ba8c053bef91a327e58de214e05f0d6768605
28 files changed