Merge "Adding metadata for syndic master functionality"

metadata/service/master/syndic.yml

+parameters:
+  salt:
+    master:
+      order_masters: true

metadata/service/syndic/cluster.yml

+parameters:
+  salt:
+    syndic:
+      enabled: true
+      masters:
+      - host: ${_param:salt_syndic_master_address_01}
+      - host: ${_param:salt_syndic_master_address_02}

metadata/service/syndic/single.yml

+parameters:
+  salt:
+    syndic:
+      enabled: true
+      master:
+        host: ${_param:salt_syndic_master_address}