Change success status code to 202

As I already mentioned here: a1b1182662 (diff-d04a476e5d71372918cb6e7e5b39a683R120) @jimi-c added some "hidden" additional check in his urllib commit and broke the whole module for everybody as Datadog answers with an 202 in case of success (http://docs.datadoghq.com/api/#troubleshooting).

lib/ansible/modules/extras/monitoring/datadog_event.py

@@ -142,7 +142,7 @@ def post_event(module):
     headers = {"Content-Type": "application/json"}
 
     (response, info) = fetch_url(module, uri, data=json_body, headers=headers)
-    if info['status'] == 200:
+    if info['status'] == 202:
         response_body = response.read()
         response_json = module.from_json(response_body)
         if response_json['status'] == 'ok':