Add missing schema for update agent API

There is missing response schema for update Agent API.

This commit adds the same and also correcting the unit test for
update agent.

Change-Id: I68a5f038d58c1fd1026475516c34aa5d0d82b74f

tempest_lib/api_schema/response/compute/v2_1/agents.py

@@ -55,6 +55,28 @@ create_agent = {
     }
 }
 
+update_agent = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'agent': {
+                'type': 'object',
+                'properties': {
+                    'agent_id': {'type': ['integer', 'string']},
+                    'version': {'type': 'string'},
+                    'url': {'type': 'string', 'format': 'uri'},
+                    'md5hash': {'type': 'string'}
+                },
+                'additionalProperties': False,
+                'required': ['agent_id', 'version', 'url', 'md5hash']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['agent']
+    }
+}
+
 delete_agent = {
     'status_code': [200]
 }

tempest_lib/services/compute/agents_client.py

@@ -51,4 +51,5 @@ class AgentsClient(rest_client.RestClient):
         put_body = json.dumps({'para': kwargs})
         resp, body = self.put('os-agents/%s' % agent_id, put_body)
         body = json.loads(body)
+        self.validate_response(schema.update_agent, resp, body)
         return rest_client.ResponseBody(resp, body)

tempest_lib/tests/services/compute/test_agents_client.py

@@ -33,11 +33,8 @@ class TestAgentsClient(base.BaseComputeServiceTest):
     FAKE_UPDATE_AGENT = {
         "agent": {
             "url": "http://foo.com",
-            "hypervisor": "kvm",
             "md5hash": "md5",
             "version": "2",
-            "architecture": "x86_64",
-            "os": "linux",
             "agent_id": 1
         }
     }