Set Glance default_store to rbd in [glance_store]

Glance is moving from [DEFAULT] to [glance_store] for this option.
Since lib/glance sets both, let's also set it in both places for now.

Failing to do this causes g-api to fail to start with error:
"Store for scheme swift not found"

Change-Id: I9e33ababf7c51f5c750f90b8b366b9892bb4c8cd

Author: eharney

lib/ceph

@@ -197,8 +197,12 @@ function configure_ceph_glance {
     fi
     sudo ceph -c ${CEPH_CONF_FILE} auth get-or-create client.${GLANCE_CEPH_USER} mon "allow r" osd "allow class-read object_prefix rbd_children, allow rwx pool=${GLANCE_CEPH_POOL}" | sudo tee ${CEPH_CONF_DIR}/ceph.client.${GLANCE_CEPH_USER}.keyring
     sudo chown ${STACK_USER}:$(id -g -n $whoami) ${CEPH_CONF_DIR}/ceph.client.${GLANCE_CEPH_USER}.keyring
+
+    # NOTE(eharney): When Glance has fully migrated to Glance store,
+    # default_store can be removed from [DEFAULT].  (See lib/glance.)
     iniset $GLANCE_API_CONF DEFAULT default_store rbd
     iniset $GLANCE_API_CONF DEFAULT show_image_direct_url True
+    iniset $GLANCE_API_CONF glance_store default_store rbd
     iniset $GLANCE_API_CONF glance_store stores "file, http, rbd"
     iniset $GLANCE_API_CONF glance_store rbd_store_ceph_conf $CEPH_CONF_FILE
     iniset $GLANCE_API_CONF glance_store rbd_store_user $GLANCE_CEPH_USER