templates: Configure galera socket per distribution

openSUSE uses /var/run/mysql/mysql.sock instead of
/var/run/mysqld/mysqld.sock so make this option distro configurable.

Change-Id: I5a42bd5bdab1a89bfc1e39b6764a1380d8d98918
(cherry picked from commit bc8a4826ac)

templates/my.cnf.j2

@@ -10,11 +10,11 @@
 
 [client]
 port = 3306
-socket = /var/run/mysqld/mysqld.sock
+socket = "{{ galera_var_run_socket }}"
 
 
 [mysqld_safe]
-socket = /var/run/mysqld/mysqld.sock
+socket = "{{ galera_var_run_socket }}"
 nice = 0
 log_error = /var/log/mysql_logs/galera_server_error.log
 

vars/redhat-7.yml

@@ -31,6 +31,7 @@ galera_server_required_distro_packages:
 
 galera_etc_conf_file: "/etc/mysql/my.cnf"
 galera_etc_include_dir: "/etc/mysql/conf.d"
+galera_var_run_socket: "/var/run/mysqld/mysqld.sock"
 
 _galera_mariadb_server_package: "MariaDB-server"
 

vars/suse-42.yml

@@ -30,6 +30,7 @@ galera_server_required_distro_packages:
 
 galera_etc_conf_file: "/etc/my.cnf"
 galera_etc_include_dir: "/etc/my.cnf.d"
+galera_var_run_socket: "/var/run/mysql/mysql.sock"
 
 _galera_mariadb_server_package: "mariadb"
 

vars/ubuntu-16.04.yml

@@ -42,6 +42,7 @@ galera_server_required_distro_packages:
 
 galera_etc_conf_file: "/etc/mysql/my.cnf"
 galera_etc_include_dir: "/etc/mysql/conf.d"
+galera_var_run_socket: "/var/run/mysqld/mysqld.sock"
 
 # The package name for mariaDB is set as a variable
 # so that it can be used in debconf later in the