From: Karthikeyan Singaravelan <tir.karthi@gmail.com>
Date: Fri, 10 Apr 2020 06:30:21 +0000
Subject: [PATCH] Import ABC from collections.abc instead of collections for
 Python 3 compatibility.

--- a/test_server/server.py
+++ b/test_server/server.py
@@ -6,7 +6,11 @@
 import time
 import types
 from six.moves.urllib.parse import urljoin
-from collections import defaultdict, Iterable
+from collections import defaultdict
+try:
+    from collections.abc import Iterable
+except ImportError:
+    from collections import Iterable
 
 import six
 from webtest.http import StopableWSGIServer