[pkg-apparmor] Bug#904599: Don't include python-apparmor nor python-libapparmor in Buster

[intrigeri at debian.org]

Package: python-apparmor
Version: 2.13-3
Severity: normal

1. They have no reverse-deps on Debian.
2. I'd rather not encourage new software being written using the
   Python 2 bindings.
3. There's been 2 Debian stable releases with both Python 2 and Python
   3 binding included, which should be enough to migrate. Stretch is
   still supported for a good while anyway.