catch etcd in scripts/

scripts/uncloud

@@ -71,20 +71,22 @@ if __name__ == '__main__':
         # module to not inherit anything from parent.
         # mp.set_start_method('spawn')
         arguments = vars(args)
-        print(arguments)
-        print(etcd_parser)
-
         name = arguments.pop('command')
         mod = importlib.import_module('uncloud.{}.main'.format(name))
         main = getattr(mod, 'main')
 
-        if component in ETCD_COMPONENTS:
+        # If the component requires etcd3, we import it and catch the
+        # etcd3.exceptions.ConnectionFailedError
+        if name in ETCD_COMPONENTS:
             import etcd3
+
         try:
             main(arguments)
         except UncloudException as err:
             logger.error(err)
             sys.exit(1)
+        except etcd3.exceptions.ConnectionFailedError as err:
+            logger.error("Cannot connect to etcd")
         except Exception as err:
             logger.exception(err)
             sys.exit(1)