Verify delete agent response of V2/V3 APIs

This patch adds the JSON schema for response status of Nova agent delete APIs
to block the backward incompatibility change in the future.

delete agent does not return the response body.
Response status of above APIs is below:
V2 : 200
V3 : 204

Partially implements blueprint nova-api-attribute-test

Change-Id: I1040b61b081d783a7c206189e11d16f9f9e77f91
diff --git a/tempest/api_schema/compute/v2/agents.py b/tempest/api_schema/compute/v2/agents.py
new file mode 100644
index 0000000..837731f
--- /dev/null
+++ b/tempest/api_schema/compute/v2/agents.py
@@ -0,0 +1,17 @@
+# 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.
+
+delete_agent = {
+    'status_code': [200]
+}
diff --git a/tempest/api_schema/compute/v3/agents.py b/tempest/api_schema/compute/v3/agents.py
new file mode 100644
index 0000000..63d1c46
--- /dev/null
+++ b/tempest/api_schema/compute/v3/agents.py
@@ -0,0 +1,17 @@
+# 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.
+
+delete_agent = {
+    'status_code': [204]
+}
diff --git a/tempest/services/compute/json/agents_client.py b/tempest/services/compute/json/agents_client.py
index 1edd1e9..19821e7 100644
--- a/tempest/services/compute/json/agents_client.py
+++ b/tempest/services/compute/json/agents_client.py
@@ -15,6 +15,7 @@
 import json
 import urllib
 
+from tempest.api_schema.compute.v2 import agents as schema
 from tempest.common import rest_client
 from tempest import config
 
@@ -46,7 +47,9 @@
 
     def delete_agent(self, agent_id):
         """Delete an existing agent build."""
-        return self.delete('os-agents/%s' % str(agent_id))
+        resp, body = self.delete("os-agents/%s" % str(agent_id))
+        self.validate_response(schema.delete_agent, resp, body)
+        return resp, body
 
     def update_agent(self, agent_id, **kwargs):
         """Update an agent build."""
diff --git a/tempest/services/compute/v3/json/agents_client.py b/tempest/services/compute/v3/json/agents_client.py
index 6893af2..e1c286c 100644
--- a/tempest/services/compute/v3/json/agents_client.py
+++ b/tempest/services/compute/v3/json/agents_client.py
@@ -15,6 +15,7 @@
 import json
 import urllib
 
+from tempest.api_schema.compute.v3 import agents as schema
 from tempest.common import rest_client
 from tempest import config
 
@@ -43,7 +44,9 @@
 
     def delete_agent(self, agent_id):
         """Delete an existing agent build."""
-        return self.delete('os-agents/%s' % str(agent_id))
+        resp, body = self.delete("os-agents/%s" % str(agent_id))
+        self.validate_response(schema.delete_agent, resp, body)
+        return resp, body
 
     def update_agent(self, agent_id, **kwargs):
         """Update an agent build."""