Updated documents to show Queens and Steins as past tense and removed where
possible. Proceedure changes may need to done to the following files:
post_deployment/upgrade/major_upgrade.rst
post_deployment/upgrade/fast_forward_upgrade.rst
post_deployment/upgrade/undercloud.rst
post_deployment/tempest/tempest.rst
features/baremetal_overcloud.rst
features/deployed_server.rst
Wallaby repo section added to the repositories.rst file.
Change-Id: I45ca3ccdb69bad2dfa822558d146e81114eaf7d3
b84f61a36c