userportal,webadmin: Reload on logout

- When clicking the logout button, also do a page refresh.
- Removed all code that deals with cleaning up models in webadmin
  and user portal, as this is no longer required.
- Renamed the UiCommonInit event to ModelInitialized event.

Change-Id: Id5c665ed85495b7c4baf4f0984b006ee2a7730f9
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1112404
Signed-off-by: Alexander Wels <awels@redhat.com>