Add comment service request time logging to Datadog

lms/lib/comment_client/utils.py

+from dogapi import dog_stats_api
 import json
 import logging
 import requests
@@ -32,10 +33,11 @@ def perform_request(method, url, data_or_params=None, *args, **kwargs):
         data_or_params = {}
     data_or_params['api_key'] = settings.API_KEY
     try:
-        if method in ['post', 'put', 'patch']:
-            response = requests.request(method, url, data=data_or_params, timeout=5)
-        else:
-            response = requests.request(method, url, params=data_or_params, timeout=5)
+        with dog_stats_api.timer('comment_client.request.time'):
+            if method in ['post', 'put', 'patch']:
+                response = requests.request(method, url, data=data_or_params, timeout=5)
+            else:
+                response = requests.request(method, url, params=data_or_params, timeout=5)
     except Exception as err:
         # remove API key if it is in the params
         if 'api_key' in data_or_params: