caps: allow rpm name to be different from reported package name

This patch makes it easier to ship a package which is implemented by a
differently-named rpm. It mimics what we have for Debian, even though
currently this patch keeps the exact mapping.

Change-Id: I2c0896e2926e68d3d4c914bf852d84f0823de4f1
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/12047
Reviewed-by: Timothy Asir <tjeyasin@redhat.com>
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>