Remove Debian packaging

The packaging used for uploads to Debian is maintained on Debian
infrastructure, presently at
http://anonscm.debian.org/cgit/pkg-k5-afs/openafs.git .

The packaging repository for any given Debian openafs source
package will be listed in the Vcs-* fields in the package's
control file.

The version of the Debian packaging in the openafs repository
will almost always be out-of-date and is not used by Debian,
and the actual packaging used by Debian is easily available, so
there is no purpose in maintaining Debian packaging in the OpenAFS
source code repository.

Change-Id: I23011315ece011e32cdddd992c4f8a176e348c67
Reviewed-on: http://gerrit.openafs.org/11621
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>