build_rpms.sh: terminate on unpackaged files

build_rpms.sh: terminate on unpackaged files

As Ceph changes and new files get installed by default, we need to
ensure that the commits which create these files also update the
packaging files lists as well.

One way to do this is to tell Gitbuilder to stop skipping unpackaged
files in the RPMs. This will cause Gitbuilder builds to indicate a
failure when new files get added without packaging updates.

Signed-off-by: Ken Dreyer <kdreyer@redhat.com>