Ceph: update namespace client key script to hard fail sucessfully

This PS updates the ceph namespace client key script to hard fail
if it cannot get the admin storage key from the namespace ceph is
deployed into.

Change-Id: Ieefe6d800a678d721294561b25bbebc874cfa74d

ceph/templates/bin/_ceph-namespace-client-key.sh.tpl

@@ -20,6 +20,9 @@ set -ex
 
 ceph_activate_namespace() {
   kube_namespace=$1
+  CEPH_KEY=$(kubectl get secret ${PVC_CEPH_STORAGECLASS_ADMIN_SECRET_NAME} \
+      --namespace=${PVC_CEPH_STORAGECLASS_DEPLOYED_NAMESPACE} \
+      -o json | jq -r '.data | .[]')
   {
   cat <<EOF
 apiVersion: v1
@@ -29,9 +32,7 @@ metadata:
 type: kubernetes.io/rbd
 data:
   key: |
-    $(kubectl get secret ${PVC_CEPH_STORAGECLASS_ADMIN_SECRET_NAME} \
+    $(echo ${CEPH_KEY})
-        --namespace=${PVC_CEPH_STORAGECLASS_DEPLOYED_NAMESPACE} \
-        -o json | jq -r '.data | .[]')
 EOF
   } | kubectl create --namespace ${kube_namespace} -f -
 }