failover fix

salt/files/minion.conf

@@ -8,7 +8,7 @@ master:
 - {{ master.host }}
 {%- endfor %}
 
-{%- if minion.master_type == "failover" %}
+{%- if minion.get('master_type', 'default') == "failover" %}
 master_type: failover
 master_shuffle: True
 master_alive_interval: 60