Update conditions for mysql settings in minion.conf

There was a wrong assumption that if galera.master or
galera.slave or mysql.server was defined in pillar we tried
to pick user/password from pillar.
This patch updates condition to ensure that enabled attribute
set to True.

Related-Prod: PROD-16658

Change-Id: I9cdd9259000d7fc648b41d7402dc8ffe9659955b

salt/files/minion.conf

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