update OpenStack, LLC to OpenStack Foundation

fixes bug 1154745

The previous update (https://review.openstack.org/#/c/24103/) missed
header files that contained "OpenStack, LLC".  This change corrects the
missed files to reflect the OpenStack Foundation.

Change-Id: I9c6de265267485ef2c82ea7e6d8643e82134d102
(cherry picked from commit 65e3d8c9773880094c0a4c164e046fae9cb7a5d9)