[Rpm-metadata] xml update

[seth vidal]

> Hmm. Can we please have Priority in non-deb specific place? Rpm itself
> doesn't support that but apt-rpm does. The priority support in apt-rpm
> is clumsy at best (/etc/apt/rpmpriorities file) currently but for the
> xml one could set it much more sanely per repository. Similarly apt-rpm
> *could* use Suggests and Enhances, it just currently doesn't since that
> info isn't available anywhere.

anything that is specific to a particular packaging tool will need to be
prefaced by a namespace for that tool and should not affect other tools

so
<apt-rpm:priority>1</apt-rpm:priority>  seems reasonable  for
repositories generated by apt-rpm's mechanism

alternately storing this data in an additional file keyed off of the pkg
nevral+checksum might be worthwhile.

-sv