fix(parameters): use correct config file for CentOS

unbound/parameters/os/CentOS.yaml

@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+#
+# Set values specific to:
+#   salt['config.get']('os') == Fedora.
+#
+# You just need to add the key:values for this `os` that differ
+# from `defaults.yaml` + `<osarch>.yaml` + `<os_family>.yaml`.
+#
+# If you do not need to provide defaults via the `os` config,
+# you can remove this file or provide at least an empty dict, e.g.
+# values: {}
+---
+values:
+  config: '/etc/unbound/unbound.conf'
+  config_dir: '/etc/unbound'
+...