Update DeckHand Operator

The validation endpoint should take the form of

/api/v1.0/revisions/{revision_id}/validations

This is different from what is currently defined
in the DeckHand Operator.  This P.S. is meant to
correct the endpoint and add more logging output.

Change-Id: I5be585df6fac96b9a27758cbb5dd90c5be163098

shipyard_airflow/plugins/deckhand_operator.py

@@ -124,6 +124,8 @@ class DeckhandOperator(BaseOperator):
         except requests.exceptions.RequestException as e:
             raise AirflowException(e)
 
+        logging.info(revisions)
+
         # Print the number of revisions that is currently available on
         # DeckHand
         logging.info("The number of revisions is %s", revisions['count'])
@@ -153,6 +155,7 @@ class DeckhandOperator(BaseOperator):
 
         # Form Validation Endpoint
         validation_endpoint = os.path.join(context['svc_endpoint'],
+                                           'revisions',
                                            str(context['revision_id']),
                                            'validations')
         logging.info(validation_endpoint)
@@ -166,6 +169,8 @@ class DeckhandOperator(BaseOperator):
         except requests.exceptions.RequestException as e:
             raise AirflowException(e)
 
+        logging.info(retrieved_list)
+
         # Initialize Validation Status
         validation_status = True