Verify os-migration API response attributes

Now most attributes of Nova v2/v3 APIs are not checked in Tempest,
and this patch adds some tests which check these attributes to block
the backward incompatibility change in the future.

This patch adds the checks of v2/v3 os-migration API responses.

The response body of the API is the below:
 {
   "migrations": [
     {
       "id": 1,
       "status": "finished",
       "instance_uuid": "e9e4fdd7-f956-44ff-bfeb-d654a96ab3a2",
       "source_node": "localhost-dev",
       "source_compute": "localhost-dev",
       "dest_node": "localhost-dev",
       "dest_compute": "localhost-dev",
       "dest_host": "192.168.11.100",
       "old_instance_type_id": 6,
       "new_instance_type_id": 2,
       "created_at": "2014-03-18T00:14:49.000000",
       "updated_at": "2014-03-18T00:15:15.000000"
     }
   ]
 }

Partially implements blueprint nova-api-attribute-test

Change-Id: I21b7f55aa3310424f9c200c60a77e305af44cb48
diff --git a/tempest/api_schema/compute/migrations.py b/tempest/api_schema/compute/migrations.py
new file mode 100644
index 0000000..6723869
--- /dev/null
+++ b/tempest/api_schema/compute/migrations.py
@@ -0,0 +1,56 @@
+# Copyright 2014 NEC Corporation.  All rights reserved.
+#
+#    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.
+
+list_migrations = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'migrations': {
+                'type': 'array',
+                'items': {
+                    'type': 'object',
+                    'properties': {
+                        # NOTE: Now the type of 'id' is integer, but here
+                        # allows 'string' also because we will be able to
+                        # change it to 'uuid' in the future.
+                        'id': {'type': ['integer', 'string']},
+                        'status': {'type': 'string'},
+                        'instance_uuid': {'type': 'string'},
+                        'source_node': {'type': 'string'},
+                        'source_compute': {'type': 'string'},
+                        'dest_node': {'type': 'string'},
+                        'dest_compute': {'type': 'string'},
+                        'dest_host': {'type': 'string'},
+                        'old_instance_type_id': {
+                            'type': ['integer', 'string']
+                        },
+                        'new_instance_type_id': {
+                            'type': ['integer', 'string']
+                        },
+                        'created_at': {'type': 'string'},
+                        'updated_at': {'type': ['string', 'null']}
+                    },
+                    'required': [
+                        'id', 'status', 'instance_uuid', 'source_node',
+                        'source_compute', 'dest_node', 'dest_compute',
+                        'dest_host', 'old_instance_type_id',
+                        'new_instance_type_id', 'created_at', 'updated_at'
+                    ]
+                }
+            }
+        },
+        'required': ['migrations']
+    }
+}
diff --git a/tempest/services/compute/json/migrations_client.py b/tempest/services/compute/json/migrations_client.py
index a13349e..beef5d2 100644
--- a/tempest/services/compute/json/migrations_client.py
+++ b/tempest/services/compute/json/migrations_client.py
@@ -15,6 +15,7 @@
 import json
 import urllib
 
+from tempest.api_schema.compute import migrations as schema
 from tempest.common import rest_client
 from tempest import config
 
@@ -36,4 +37,5 @@
 
         resp, body = self.get(url)
         body = json.loads(body)
+        self.validate_response(schema.list_migrations, resp, body)
         return resp, body['migrations']
diff --git a/tempest/services/compute/v3/json/migration_client.py b/tempest/services/compute/v3/json/migration_client.py
index efd39b7..c821567 100644
--- a/tempest/services/compute/v3/json/migration_client.py
+++ b/tempest/services/compute/v3/json/migration_client.py
@@ -12,8 +12,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import json
 import urllib
 
+from tempest.api_schema.compute import migrations as schema
 from tempest.common import rest_client
 from tempest import config
 
@@ -34,4 +36,6 @@
             url += '?%s' % urllib.urlencode(params)
 
         resp, body = self.get(url)
-        return resp, self._parse_resp(body)
+        body = json.loads(body)
+        self.validate_response(schema.list_migrations, resp, body)
+        return resp, body['migrations']