update cinder's key permission to allow nova snapshots

Preparing the field for this patch:

https://review.openstack.org/205282

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

Change-Id: I98f16167db864ffd14e8c3dd5dec81fc16245448
diff --git a/lib/ceph b/lib/ceph
index 6af4b3a..8e34aa4 100644
--- a/lib/ceph
+++ b/lib/ceph
@@ -326,7 +326,7 @@
     sudo ceph -c ${CEPH_CONF_FILE} osd pool create ${CINDER_CEPH_POOL} ${CINDER_CEPH_POOL_PG} ${CINDER_CEPH_POOL_PGP}
     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=${GLANCE_CEPH_POOL}" | \
+        osd "allow class-read object_prefix rbd_children, allow rwx pool=${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
     sudo chown ${STACK_USER}:$(id -g -n $whoami) ${CEPH_CONF_DIR}/ceph.client.${CINDER_CEPH_USER}.keyring
 }