Fix bug in retries usage; mantain behaviour

The number of retries was being passed as the pool size parameter.
This is corrected but number of retries changed to 1 to maintain previous behaviour.

server/lib/python/cartodb_services/cartodb_services/mapzen/routing.py

@@ -15,7 +15,7 @@ class MapzenRouting(Traceable):
     PRODUCTION_ROUTING_BASE_URL = 'https://valhalla.mapzen.com/route'
     READ_TIMEOUT = 60
     CONNECT_TIMEOUT = 10
-    MAX_RETRIES=3
+    MAX_RETRIES=0
 
     ACCEPTED_MODES = {
         "walk": "pedestrian",
@@ -50,7 +50,7 @@ class MapzenRouting(Traceable):
         request_params = self.__parse_request_parameters(json_request_params)
         # TODO Extract HTTP client wrapper
         session = requests.Session()
-        session.mount(self._url, HTTPAdapter(self.MAX_RETRIES))
+        session.mount(self._url, HTTPAdapter(max_retries=self.MAX_RETRIES))
         response = session.get(self._url, params=request_params,
                                 timeout=(self.CONNECT_TIMEOUT, self.READ_TIMEOUT))
         self.add_response_data(response, self._logger)