Fix bcfg2-lint errors to make this config closer to working from scratch

Some fixes to help pass bcfg2-lint:

- Add info.xml files for Cfg entries
- Give pbuilder bundle 'Bundle' element a 'name' attribute

Minimally, to make this work from scratch, these are also needed:

- /etc/bcfg2.conf
- Metadata/distros.xml:  disable groups w/bundles
- Packages plugin with pkg sources
- Probes plugin with architecture probe
- Metadata/groups.xml with <xi:include href="localgroups.xml"/>