Allow show assigned repo in image/create

Allow only the creation of images in the repository that is currently
assigned to the selected client.

This operation is still not handled in ogserver and oglive, it needs
more work behind the scenes: it needs an update in the templates and
it also needs the new ogLive builder so ogClient has control on the
samba mount.

ogcp/views.py

@@ -1269,9 +1269,7 @@ def action_image_create():
         repositories = get_repositories(server)
         form.repository.choices = [ (repo['id'], repo['name']) for repo in repositories
                                    if client_repo_id == repo['id']]
-        for repo in repositories:
-            if client_repo_id != repo['id']:
-                form.repository.choices.append((repo['id'], repo['name']))
+        form.repository.render_kw = {'readonly': True}
 
         scopes, clients = get_scopes(set(ips))
         return render_template('actions/image_create.html', form=form,