fixes #6547 / BZ 1115468 - delete puppet modules from content view on repo delete

When a puppet repository is deleted (e.g. from Content -> Products),
if any of the puppet modules in that repository are associated with
an existing content view (via ContentViewPuppetModule), they need
to be removed from the content view.  This commit will do just
that, providing a behavior that is consistent with when a user
deletes a yum repository (i.e those repositories are removed
from the content view).
What happens if the puppet module is in another repo within library in that same Org?  I'd assume we'd want to keep it, but it looks like here it'd delete it.