+1 maintenance

[Matthias Klose]

- removal of NBS in -proposed
- looked at some "uninstallable" packages, two of them were
  caused by ftbfs of dependent packages. successfully retried builds.
- looked at openmpi and connected transitions
  - very puzzled about the dolfin ftbfs ...
  - finally found out that openmpi needed a rebuild with new pmix
  - and dolfin built
  - no-change uploads for some openmpi dependent packages
  - retries some tests with the rebuilt packages, but the queues are busy ...
- addressed some binary component mismatches
- looked at bpftrace and bpfcc, blocked by old linux binaries left.
  removed those.

Matthias