df246885d0
Added a water mark to galera role documentation to make clear to deployers which release they're working with. Modified conf.py that adds watermark to the documentation according to particular branch. If the current branch is master than watermark is 'Pre-release' and if the current branch is stable/<release-name> than watermark is <release-name>. This is a combined implementation based on the following patches: - https://review.openstack.org/372565 - https://review.openstack.org/382637 - https://review.openstack.org/384140 Related-Bug: #1624489 Change-Id: Idf26db677a71bc9b3e1d22b4ca86bb7d2e5cd232