Replace OpenStack LLC with OpenStack Foundation

Some files still use trademark OpenStack LLC in header, which
should be changed to OpenStack Foundation.

NOTE: tools/install_venv.py is not synced from oslo-incubator, so
it is modified too.

Change-Id: I0084684ff5225076291fea857eb010d638291bd0
Fixes-Bug: #1214176
diff --git a/tools/skip_tracker.py b/tools/skip_tracker.py
index c244808..c38ccdb 100755
--- a/tools/skip_tracker.py
+++ b/tools/skip_tracker.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim: tabstop=4 shiftwidth=4 softtabstop=4
 
-# Copyright 2012 OpenStack, LLC
+# Copyright 2012 OpenStack Foundation
 # All Rights Reserved.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License"); you may