Fix galera.slave setup in minion.conf

salt/files/minion.conf

 mysql.db: 'mysql'
 mysql.charset: 'utf8'
 
+{%- elif pillar.get('galera', {}).slave is defined %}
+
+{%- from "galera/map.jinja" import slave with context %}
+mysql.unix_socket: {{ slave.socket }}
+mysql.user: '{{ pillar.galera.slave.admin.user }}'
+mysql.pass: '{{ pillar.galera.slave.admin.password }}'
+mysql.db: 'mysql'
+mysql.charset: 'utf8'
+
 {%- elif pillar.get('mysql', {}).server is defined %}
 
 mysql.unix_socket: /var/run/mysqld/mysqld.sock