Increase the timeout waiting for workflows to finish. (#167)

* In kubeflow/kubeflow#1109 We are seeing lots of timeouts waiting for the
  test workflows too complete.

* Bump the timeout to 1 hour.

py/kubeflow/testing/run_e2e_workflow.py

@@ -193,6 +193,7 @@ def run(args, file_handler): # pylint: disable=too-many-statements,too-many-bran
   try:
     results = argo_client.wait_for_workflows(api_client, get_namespace(args),
                                              workflow_names,
+                                             timeout=datetime.timedelta(minutes=60),
                                              status_callback=argo_client.log_status)
     for r in results:
       phase = r.get("status", {}).get("phase")