Stretch support

- Support Debian Stretch (MariaDB debian/upstream + Galera)
- Doc updated
- New travis tests (with Vagrant)
- Drop support of mysql_innodb_additional_mem_pool_size
- Xtrabackup optionnal installation + package name updatable
- Fix many issues with replication (Ansible 2.3)
- Auto-retreive master IP address on tests
- MySQL tools per OS release

tasks/install/main.yml

@@ -35,9 +35,8 @@
 
 - name: APT | Install few MySQL related tools
   apt: pkg={{ item }} state=present install_recommends=no
-  with_items:
-    - mytop
-    - percona-toolkit
-    - percona-xtrabackup
-    - python-mysqldb
-    - mysqltuner
+  with_items: "{{ mysql_tools }}"
+
+- name: APT | Install percona-xtrabackup if needed
+  apt: pkg={{ mysql_xtrabackup_package }}
+  when: mysql_install_xtrabackup_package

tasks/install/mariadb/default.yml

@@ -19,4 +19,3 @@
 - name: APT | Install Galera
   apt: pkg=galera-3 state=present
   when: mysql_vendor == 'mariadb_galera'
-

tasks/install/mariadb/upstream.yml

@@ -1,7 +1,8 @@
 ---
 
 - name: APT | Install MariaDB key
-  apt_key: keyserver="keyserver.ubuntu.com" id="0xcbcb082a1bb943db" state=present
+  apt_key: keyserver="keyserver.ubuntu.com" id={{ item }} state=present
+  with_items: ['0xcbcb082a1bb943db', '0xf1656f24c74cd1d8']
 
 - name: APT | Add MariaDB repository
   apt_repository: repo='deb {{ mysql_mariadb_repository }} {{ ansible_distribution_release }} main' state=present
@@ -12,4 +13,3 @@
 
 - name: INCLUDE | Normal Install
   include: default.yml
-