Finish up flake8 conversion.

Change-Id: I5034f19d5f9b20ad2b4569455273c730b1efec08
diff --git a/tools/install_venv.py b/tools/install_venv.py
index ef7b0a8..5d4b290 100644
--- a/tools/install_venv.py
+++ b/tools/install_venv.py
@@ -3,7 +3,7 @@
 # Copyright 2010 United States Government as represented by the
 # Administrator of the National Aeronautics and Space Administration.
 # All Rights Reserved.
-#
+# flake8: noqa
 # Copyright 2010 OpenStack, LLC
 # Copyright 2013 IBM Corp.
 #