Commit I123ae390bec489a931180a2e33f4bf7b1d51edb2 broke the extended
security group code, by removing the 'is_default' attribute from the
list of fields that should have been updated in the DB.
Not sure exactly why it broke us.
Change-Id: I891bc792e62ac90683ce8745f98a3139c9ffd3d9