Allow configuration of cluster name, locale & encoding

pillar.example

@@ -26,6 +26,13 @@ postgres:
     - postgresql-contrib
     - postgresql-plpython
 
+  # CLUSTER
+  # The default `encoding` is derived from the `locale` so not recommended
+  # to provide a value for it unless necessary
+  cluster:
+    locale: en_GB.UTF-8
+    # encoding: UTF8
+
   #'Alternatives system' priority incremental. 0 disables feature.
   linux:
     altpriority: 30