Allows for configuration of the Ceph cluster name

To be able to support multiple Ceph cluster, an initial step is
to allow for configuration of each cluster name.

Depends-On: I8d5293eaaf104b6374dfa13992a67ddc37397f10
Implements: blueprint custom-ceph-cluster-name
Change-Id: I1b4d51ca6a2d08fa7a68eea680eb104eff732057

docker/services/ceph-ansible/ceph-base.yaml

@@ -69,6 +69,15 @@ parameters:
   CephClusterFSID:
     type: string
     description: The Ceph cluster FSID. Must be a UUID.
+  CephClusterName:
+    type: string
+    default: ceph
+    description: The Ceph cluster name.
+    constraints:
+    - allowed_pattern: "[a-zA-Z0-9]+"
+      description: >
+        The Ceph cluster name must be at least 1 character and contain only
+        letters and numbers.
   CephPoolDefaultPgNum:
     description: default pg_num to use for the RBD pools
     type: number
@@ -214,6 +223,7 @@ outputs:
         ceph_common_ansible_vars:
           ireallymeanit: 'yes'
           fsid: { get_param: CephClusterFSID }
+          cluster: { get_param: CephClusterName }
           docker: true
           ceph_release: luminous
           ceph_docker_registry: {get_attr: [DockerImageUrlParts, value, host]}