1132919: Repo dialog information is updated without the need for a gui restart.
1128658: do not contact RHN if unregistered

when running 'yum --disablerepo=\* makecache' we shouldn't attempt to contact
RHN. We were always making a call to get overrides which doesn't make sense if
we are not registered.
Merge pull request #1018 from candlepin/bz1128658

1128658: do not contact RHN if unregistered
1128061: Don't raise logged Disconnected on unreg

BaseActionInvoker handles and logs any exceptions
raise from *certlib actions. For unregister, when we
run the UnregisterAction, we have already deleted
id cert, ent certs, repos, so we would always raise
Disconnected, and then it would get logged.

In either cause, entcertlib's actions don't do much,
so just return empty results instead of raising an
exception that gets logged.
Merge pull request #1019 from candlepin/alikins/1128061_no_disconnected

1128061: Don't raise logged Disconnected on unreg
Merge pull request #1016 from candlepin/csnyder/update_repo_details_gui_1132919

1132919: Repo dialog information is updated without the need for a gui r...
Don't ask for org and environment with consumerid.
Disable RHN yum plugin.