Add support for ceph-nfs manila backend

If ceph-nfs (ganesha) service is enabled, it's set up by ceph-ansible
and it can be used as a manila backend. Manila can be configured to use
ceph either directly (manila-cephfsnative-config-docker.yaml env file)
or through ganesha (environments/manila-cephfganesha-config-docker.yaml
env file).

Change-Id: Ib408c7827e5fba0c1b01388db26363806fc64370
Partially-Implements: blueprint nfs-ganesha

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

@@ -0,0 +1,76 @@
+heat_template_version: pike
+
+description: >
+  Ceph NFS Ganeshaservice.
+
+parameters:
+  ServiceData:
+    default: {}
+    description: Dictionary packing service data
+    type: json
+  ServiceNetMap:
+    default: {}
+    description: Mapping of service_name -> network name. Typically set
+                 via parameter_defaults in the resource registry.  This
+                 mapping overrides those in ServiceNetMapDefaults.
+    type: json
+  DefaultPasswords:
+    default: {}
+    type: json
+  RoleName:
+    default: ''
+    description: Role name on which the service is applied
+    type: string
+  RoleParameters:
+    default: {}
+    description: Parameters specific to the role
+    type: json
+  EndpointMap:
+    default: {}
+    description: Mapping of service endpoint -> protocol. Typically set
+                 via parameter_defaults in the resource registry.
+    type: json
+
+resources:
+  CephBase:
+    type: ./ceph-base.yaml
+    properties:
+      ServiceData: {get_param: ServiceData}
+      ServiceNetMap: {get_param: ServiceNetMap}
+      DefaultPasswords: {get_param: DefaultPasswords}
+      EndpointMap: {get_param: EndpointMap}
+      RoleName: {get_param: RoleName}
+      RoleParameters: {get_param: RoleParameters}
+
+outputs:
+  role_data:
+    description: Role data for the Ceph NFS Ganesha service.
+    value:
+      service_name: ceph_nfs
+      upgrade_tasks: []
+      step_config: 'include ::tripleo::profile::pacemaker::ceph_nfs'
+      puppet_config:
+        config_image: ''
+        config_volume: ''
+        step_config: ''
+      # step_config seems to be ignored if docker_config is present
+      #docker_config: {}
+      config_settings:
+        map_merge:
+        - tripleo.ceph_nfs.firewall_rules:
+            '120 ceph_nfs':
+              dport:
+              # FIXME
+              - 2049
+              - 20048
+              - 38468
+              - 4501
+        - ceph_nfs_ansible_vars:
+            map_merge:
+            - {get_attr: [CephBase, role_data, config_settings, ceph_common_ansible_vars]}
+            - ceph_nfs_enable_service: false
+            - ceph_nfs_use_pacemaker: true
+            - ceph_nfs_dynamic_exports: true
+            - ceph_nfs_service_suffix: pacemaker
+            - nfs_obj_gw: false
+            - ceph_nfs_rados_backend: true