Set a var for the MariaDB major version

Setting a custom MariaDB mirror URL is very tedious to maintain
because operators must ensure they update the overridden repo
URL every time the major version changes within the galera role.

This will allow operators to set overrides for their local mirror
like:

galera_repo_url: "http://mirror.mydomain.com/mariadb/repo/{{ galera_major_version }}/ubuntu"

Change-Id: Ie5dd27b8cffff5245724ecc79e79272086bf3b30

defaults/main.yml

@@ -43,6 +43,9 @@ galera_debconf_items: []
 galera_server_percona_distro_packages: []
 galera_mariadb_server_package: "{{ _galera_mariadb_server_package }}"
 
+# The major version used to select the repo URL path
+galera_major_version: 10.1
+
 # Set the URL for the MariaDB repository
 galera_repo_url: "{{ _galera_repo_url }}"
 

vars/redhat-7.yml

@@ -49,7 +49,7 @@ galera_server_upgrade_packages_remove:
 
 galera_mariadb_service_name: "mariadb"
 
-_galera_repo_url: "http://yum.mariadb.org/10.1/centos/7/x86_64"
+_galera_repo_url: "http://yum.mariadb.org/{{ galera_major_version }}/centos/7/x86_64"
 _galera_repo:
   name: MariaDB
   description: "MariaDB Repo"

vars/ubuntu-16.04.yml

@@ -45,7 +45,7 @@ galera_etc_include_dir: "/etc/mysql/conf.d"
 # The package name for mariaDB is set as a variable
 # so that it can be used in debconf later in the
 # "galera_common" role.
-_galera_mariadb_server_package: "mariadb-server-10.1"
+_galera_mariadb_server_package: "mariadb-server-{{ galera_major_version }}"
 
 # NB This is specifically galera_server_mariadb_distro_packages as these
 # packages only get installed during the galera play - this is because of
@@ -105,7 +105,7 @@ _galera_percona_xtrabackup_repo:
   state: "present"
   filename: "Percona"
 
-_galera_repo_url: "http://mirror.rackspace.com/mariadb/repo/10.1/ubuntu"
+_galera_repo_url: "http://mirror.rackspace.com/mariadb/repo/{{ galera_major_version }}/ubuntu"
 _galera_repo:
   repo: "deb {{ galera_repo_url }} {{ ansible_distribution_release }} main"
   state: "present"