Sharing an updates file between the Debian and Ubuntu reprepro runs
causes some warnings, and is generally just unclean. They use
different release naming and repositories, so should just have
separate updates files to track them (they're already separate on
the server, they were just being copied from the same source file in
the module).
While here, remove the label and suite parameters from the Debian
reprepro distribution templates, as they're unnecessary and
potentially confusing (job nodes should never be relying on the
suite names as they change at the next release).
Also allow signatures from subkeys of the listed keys to be
sufficient to verify the debian-security mirror's release files,
like we do for the debian mirror.
Change-Id: Id0ff476864f936bbd7c4637f3dc9e2c219c6e465
4f0342be70
