1132919: Repo dialog information is updated without the need for a gui restart.
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.
Remove --force option for sat5to6.

In sat5to6, custom channels are allowed and expected.
Add a module with branding strings for sat5to6 to use.

The module has a funny name because it needs to come before the
redhat_branding.py file alphabetically.
Remove duplicate import and allow to run in subscription-manager repo.