Added option to disable creation of backup file when postgresql.conf changes

postgres/defaults.yaml

@@ -15,6 +15,7 @@ postgres:
   acls: []
   databases: {}
   tablespaces: {}
+  postgresconf_backup: True
   postgresconf: ""
   pg_hba.conf: salt://postgres/pg_hba.conf
   commands:

postgres/init.sls

@@ -59,6 +59,9 @@ postgresql-conf:
         {{ postgres.postgresconf|indent(8) }}
     - show_changes: True
     - append_if_not_found: True
+    {% if not postgres.postgresconf_backup|default(True) -%}
+    - backup: False
+    {% endif -%}
     - watch_in:
        - service: run-postgresql
 {% endif %}