Full buster optim (#38)

* 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

tasks/install/mariadb/default.yml

@@ -1,26 +1,5 @@
 ---
 
-- name: SHELL | Get MariaDB target version
-  shell: "LANG=C apt-cache depends mariadb-server | awk -F '-' '/Depends/ { print $NF }'"
-  register: apt_mariadb_version
-  changed_when: false
-
-- name: DEBCONF | Prepare MariaDB silent installation (root password)
-  debconf:
-    name: 'mariadb-server-{{ apt_mariadb_version.stdout }}'
-    question: 'mysql-server/root_password'
-    vtype: 'password'
-    value: '{{ mariadb_root_password }}'
-  when: not mariadb_exists.stat.exists
-
-- name: DEBCONF | Prepare MariaDB silent installation (root password again)
-  debconf:
-    name: 'mariadb-server-{{ apt_mariadb_version.stdout }}'
-    question: 'mysql-server/root_password_again'
-    vtype: 'password'
-    value: '{{ mariadb_root_password }}'
-  when: not mariadb_exists.stat.exists
-
 - name: APT | Install MariaDB server
   apt:
     pkg: mariadb-server