* fix bug 960448
* syspanel inherits nova UpdateImage view/form
* add completion_view to form base object, and get_success_url()
that reverse the proper url for redirection on success
handling
* syspanel AdminEditImage was pointless because it didn't
override the 'url', now fixed
Change-Id: Ia8f24c7a895b397f11978a59232ab00da3e8813d