Changes

debian-buster-jenkins*: remove

We are clearly not using these containers anymore, as they fail to
build:

  0.297 Err:4 http://deb.debian.org/debian buster Release
  0.297   404  Not Found [IP: 199.232.190.132 80]
  0.305 Err:5 http://deb.debian.org/debian-security buster/updates Release
  0.305   404  Not Found [IP: 199.232.190.132 80]
  0.314 Err:6 http://deb.debian.org/debian buster-updates Release
  0.314   404  Not Found [IP: 199.232.190.132 80]
  0.320 Reading package lists...
  0.334 E: The repository 'http://deb.debian.org/debian buster Release' does not have a Release file.
  0.334 E: The repository 'http://deb.debian.org/debian-security buster/updates Release' does not have a Release file.
  0.334 E: The repository 'http://deb.debian.org/debian buster-updates Release' does not have a Release file.

Change-Id: Ia7fc6aac738738c1a3929ad92ae93d0f2d6a825d

debian-bullseye-jenkins*: remove

This container does not build anymore (fails on "License classifiers
have been superseded by license expressions" while installing
lcov-to-cobertura-xml with pip). This means it is unused, remove it.

Change-Id: Iec6ecbc7446aaf3a643aec0168264dba3e671894

debian-sid-jenkins: remove

This container is not being used, and it still attempts to install
python2 which has been removed from debian sid quite some time ago.
Let's remove it.

Change-Id: Ia7e2a92cba81a51bae409e0dadfd592204bce6d0

Install osmo-python-tests with pip

Use pip to install osmo-python-tests instead of calling setup.py, so it
works with modern python packaging as well.

Related: osmo-python-tests I186544163ab02834c33f1363f3a06cd380898f56
Change-Id: I9bb5d13897dbf1be9855c4eba29c6b3a2c35729c

debian-{bullseye,bookworm}-titan[-master]: drop libfftranscode

We've meanwhile migrated to more recent TITAN release that can do
ASN.1 PER encoding/decoding, so libfftranscode is no longer needed.

Change-Id: If68f478d29f4728a9f3518b20128b195a8267955
Related: OS#6490