In VersionLinux, any binNMU version will currently match the
revision_other group in the regexp and therefore never be recognised
as an experimental, security, or backport version. This is probably
harmless in practice because:
- binNMUs don't happen in those suites
- Only debian/bin/gencontrol.py cares about the linux_revision_other
attribute, and it won't be run for a binNMU version
But let's fix it by matching the binNMU suffix separately.