fix(ceilometer): Add volume_type_id to metric meta

Cinder volume notifications emit only payload.volume_type as an id, but
the API pollster in Ceilometer gets back a name value from Cinder.
Cinder should emit the volume_type_name in its notification payloads but
sadly it does not at this time. This change should simply re-route
payload volume_type to a new field we will add in gnocchi for
volume_type_id, preventing flip-flopping of volume_type on the gnocchi
volume_type resources.

Author: LukeRepko

base-helm-configs/ceilometer/ceilometer-helm-overrides.yaml

@@ -231,7 +231,7 @@ conf:
         size:
           type: int
           fields: payload.size
-        type:
+        volume_type_id:
           fields: payload.volume_type
         replication_status:
           fields: payload.replication_status
@@ -1057,6 +1057,7 @@ conf:
         attributes:
           display_name: resource_metadata.(display_name|name)
           volume_type: resource_metadata.volume_type
+          volume_type_id: resource_metadata.volume_type_id
           image_id: resource_metadata.image_id
           instance_id: resource_metadata.instance_id
         event_create:
@@ -1295,7 +1296,7 @@ conf:
         resource_id: $.payload.volume_id
         metadata:
           display_name: $.payload.display_name
-          volume_type: $.payload.volume_type
+          volume_type_id: $.payload.volume_type
           image_id: $.payload.glance_metadata[?key=image_id].value
           instance_id: $.payload.volume_attachment[0].instance_uuid