ttcn3-bts-test: use osmo-config-merge to generate config files

This uses the config files from osmo-ttcn3-hacks.git instead of keeping
local copies around here, which has shown many times will get out of
sync. Copy the files from the git repository checked out in the
ttcn3-bts-test docker image, so we don't need to take care of cloning
the repository again and checking out the same commit as used inside
that image. Original files are copied to *.src.cfg, and then merged with
the local *.confmerge files using osmo-conf-merge (*.gen.cfg).

Unfortunately, osmo-config-merge is not capable of removing text blocks
or substituting specific parts, so we fall-back to using sed where it's
needed.  A good example is 'log gsmtap 127.0.0.1', as there is no
command for removing a logging target of such type.

Co-Authored-By: Vadim Yanitskiy <vyanitskiy@sysmocom.de>
Co-Authored-By: Oliver Smith <osmith@sysmocom.de>
Change-Id: If2d1ba8a775dc6c396f50f9853e633df110329a9
---
M .gitignore
M jenkins-common.sh
D ttcn3-bts-test/fh/osmo-bsc.cfg
A ttcn3-bts-test/fh/osmo-bsc.confmerge
M ttcn3-bts-test/jenkins.sh
D ttcn3-bts-test/oml/osmo-bts.cfg
A ttcn3-bts-test/oml/osmo-bts.confmerge
D ttcn3-bts-test/osmo-bsc.cfg
A ttcn3-bts-test/osmo-bsc.confmerge
D ttcn3-bts-test/osmo-bts.cfg
A ttcn3-bts-test/osmo-bts.confmerge
D ttcn3-bts-test/virtphy/osmo-bts.cfg
A ttcn3-bts-test/virtphy/osmo-bts.confmerge
13 files changed, 336 insertions(+), 851 deletions(-)