ref(deploy.py): placate new flake8 linter checks

Author: mboersma

rootfs/deploy.py

@@ -58,7 +58,8 @@ def get_registry_name():
     elif registryLocation == "gcr":
         return hostname + "/" + os.getenv('DEIS_REGISTRY_GCS_PROJ_ID')
     else:
-        return os.getenv("DEIS_REGISTRY_SERVICE_HOST") + ":" + os.getenv("DEIS_REGISTRY_SERVICE_PORT")  # noqa: E501
+        return "{}:{}".format(os.getenv("DEIS_REGISTRY_SERVICE_HOST"),
+                              os.getenv("DEIS_REGISTRY_SERVICE_PORT"))
 
 
 def download_file(tar_path):
@@ -80,6 +81,7 @@ def download_file(tar_path):
     ]
     subprocess.check_call(command)
 
+
 tar_path = os.getenv('TAR_PATH')
 if tar_path:
     if os.path.exists("/var/run/secrets/deis/objectstore/creds/"):