update cinder's key permission to allow nova snapshots

Preparing the field for this patch:
https://review.openstack.org/#/c/205282/2

The client.cinder key needs to have write permission to the glance pool
in order to complete the snapshot process.

Change-Id: I90c6aa056b99944aa558783f3f81d06f918f3e26
Signed-off-by: Sébastien Han <seb@redhat.com>
diff --git a/lib/ceph b/lib/ceph
index 6cf481e..aeb7191 100644
--- a/lib/ceph
+++ b/lib/ceph
@@ -295,7 +295,7 @@
     iniset $NOVA_CONF libvirt images_rbd_ceph_conf ${CEPH_CONF_FILE}
 
     if ! is_service_enabled cinder; then
-        sudo ceph -c ${CEPH_CONF_FILE} auth get-or-create client.${CINDER_CEPH_USER} mon "allow r" osd "allow class-read object_prefix rbd_children, allow rwx pool=${CINDER_CEPH_POOL}, allow rwx pool=${NOVA_CEPH_POOL},allow rx pool=${GLANCE_CEPH_POOL}" | sudo tee ${CEPH_CONF_DIR}/ceph.client.${CINDER_CEPH_USER}.keyring > /dev/null
+        sudo ceph -c ${CEPH_CONF_FILE} auth get-or-create client.${CINDER_CEPH_USER} mon "allow r" osd "allow class-read object_prefix rbd_children, allow rwx pool=${CINDER_CEPH_POOL}, allow rwx pool=${NOVA_CEPH_POOL},allow rwx pool=${GLANCE_CEPH_POOL}" | sudo tee ${CEPH_CONF_DIR}/ceph.client.${CINDER_CEPH_USER}.keyring > /dev/null
         sudo chown ${STACK_USER}:$(id -g -n $whoami) ${CEPH_CONF_DIR}/ceph.client.${CINDER_CEPH_USER}.keyring
     fi
 }