pep8: Fix many rule E128 violations.

[Tweaked by tabbott to adjust some approaches used in wrapping]

zerver/lib/test_classes.py

@@ -2,7 +2,7 @@ from __future__ import absolute_import
 from __future__ import print_function
 from contextlib import contextmanager
 from typing import (cast, Any, Callable, Dict, Iterable, Iterator, List, Mapping, Optional,
-    Sized, Tuple, Union)
+                    Sized, Tuple, Union)
 
 from django.core.urlresolvers import resolve
 from django.conf import settings