Replace OpenStack LLC with OpenStack Foundation
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 touched, should sync with oslo

Change-Id: I01d4f6b64cf1a152c4e190407799ce7d53de845f
Fixes-Bug: #1214176

varunarya10/keystonemiddleware