* Remove Stretch and Percona support
* Delete root password management (On Buster, it uses socket auth)
* Fix sync backups files master -> slave
* Cleanup legacy code on replication slave
* Use modern configuration
* Debian buster configuration style
* Drop logrotate management (useless)
* Add new default values in defaults/main.yml (according with MariaDB doc)
* Travis with Ansible 2.8+
* Drop feature "don't replicate mysql database"
* Fully compatible with python3
* README update
* Remove useless legacy files
* Small refactoring for Galera Cluster
* Modern Ansible
* Some changes on travis + Vagrant
* Help debug: display all facts
* Fix galera config for docker