Project may now be assigned to multiple project groups.

The group annotation was initially created with the assumption that a
project would be assigned to a single group. Storyboard now supports
multiple project group membership, so the config file needs to be
updated accordingly.

Do not merge before https://review.openstack.org/#/c/111814/

Change-Id: I1b11b6eee7b071592b052d9bbc5b874e49e2ef77
Merge "Project may now be assigned to multiple project groups."