Remove config-common from component archetype

Having the common config in a separate file that was included from
config-{rpm,xml}.pan was causing problems where some components forgot
to include -common. config.pan is always included so that's the best
place to put shared config.
Remove config-xml from component archetype

Delivering component code via the profile is deprecated in favour of rpm
distribution so there's no need to add a config-xml when generating a
new component.
Merge pull request #10 from ned21/component-config-cleanup

Component config cleanup