[placement] Separate API schemas (aggregate)

In compute APIs, they have their schemas in the
independent directory (nova/api/openstack/compute/schemas).
Placement APIs should be like that as well.

This patch separates API schemas to an independent directory
(nova/api/openstack/placement/schemas)
from nova/api/openstack/placement/handlers/aggregate.py.

Subsequent patches will move schemas of other handlers.

Change-Id: I1b526b1df28c281bd456f35bc0f5c5d9c2464c7e

nova/api/openstack/placement/handlers/aggregate.py

@@ -16,21 +16,12 @@ from oslo_utils import encodeutils
 from oslo_utils import timeutils
 
 from nova.api.openstack.placement import microversion
+from nova.api.openstack.placement.schemas import aggregate as schema
 from nova.api.openstack.placement import util
 from nova.api.openstack.placement import wsgi_wrapper
 from nova.objects import resource_provider as rp_obj
 
 
-PUT_AGGREGATES_SCHEMA = {
-    "type": "array",
-    "items": {
-        "type": "string",
-        "format": "uuid"
-    },
-    "uniqueItems": True
-}
-
-
 def _send_aggregates(req, aggregate_uuids):
     want_version = req.environ[microversion.MICROVERSION_ENVIRON]
     response = req.response
@@ -80,7 +71,7 @@ def set_aggregates(req):
     uuid = util.wsgi_path_item(req.environ, 'uuid')
     resource_provider = rp_obj.ResourceProvider.get_by_uuid(
         context, uuid)
-    aggregate_uuids = util.extract_json(req.body, PUT_AGGREGATES_SCHEMA)
+    aggregate_uuids = util.extract_json(req.body, schema.PUT_AGGREGATES_SCHEMA)
     resource_provider.set_aggregates(aggregate_uuids)
 
     return _send_aggregates(req, aggregate_uuids)

nova/api/openstack/placement/schemas/aggregate.py

@@ -0,0 +1,22 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+"""Aggregate schemas for Placement API."""
+
+
+PUT_AGGREGATES_SCHEMA = {
+    "type": "array",
+    "items": {
+        "type": "string",
+        "format": "uuid"
+    },
+    "uniqueItems": True
+}