correct volumes name source

- cinder has volume's name under volume attribute in v2[1] and v3[2].
display_name only exists in v1 and notifications
- add backup.* notifications
- specifically capture display_name
- specifically capture volume_type

[1] http://developer.openstack.org/api-ref/block-storage/v2/?expanded=show-volume-details-detail,show-snapshot-details-detail,show-backup-details-detail
[2] http://developer.openstack.org/api-ref/block-storage/v3/?expanded=show-backup-detail-detail,list-snapshots-and-details-detail,show-a-volume-s-details-detail

Change-Id: I9cbec274571b69a0a03da043614d50a67742d85f

ceilometer/dispatcher/data/gnocchi_resources.yaml

@@ -192,7 +192,7 @@ resources:
       - 'snapshot.size'
       - 'volume.snapshot.size'
     attributes:
-      display_name: resource_metadata.display_name
+      display_name: resource_metadata.(display_name|name)
     event_delete: volume.delete.start
     event_attributes:
       id: resource_id

ceilometer/meter/data/meters.yaml

@@ -45,6 +45,9 @@ metric:
     user_id: $.payload.user_id
     project_id: $.payload.tenant_id
     resource_id: $.payload.volume_id
+    metadata:
+      display_name: $.payload.display_name
+      volume_type: $.payload.volume_type
 
   - name: 'snapshot.size'
     event_type:
@@ -57,6 +60,23 @@ metric:
     user_id: $.payload.user_id
     project_id: $.payload.tenant_id
     resource_id: $.payload.snapshot_id
+    metadata:
+      display_name: $.payload.display_name
+
+  - name: 'backup.size'
+    event_type:
+      - 'backup.exists'
+      - 'backup.create.*'
+      - 'backup.delete.*'
+      - 'backup.restore.*'
+    type: 'gauge'
+    unit: 'GB'
+    volume: $.payload.size
+    user_id: $.payload.user_id
+    project_id: $.payload.tenant_id
+    resource_id: $.payload.backup_id
+    metadata:
+      display_name: $.payload.display_name
 
   # Magnum
   - name: $.payload.metrics.[*].name