Replace OpenStack LLC with OpenStack Foundation

Correct the copyright headers to be consistent with the policies
outlined by the OpenStack Foundation at
http://www.openstack.org/brand/openstack-trademark-policy/

Remove references to OpenStack LLC, replace with OpenStack Foundation

Change-Id: Iec8f554a5c279c39580c00abd50e3a9b2e6bf219
Fixes-Bug: #1214176