Introduce keystone:config

This keystone::config is aim to use keystone_config resources
to manage custom configurations in keystone config files.

This will make end user easy to add their own custom options
in Hiera data.

Fully implements blueprint keystone-custom-config

Change-Id: I1e0742382bfca3f627029c7f17fe05fd9d3d0dbe

manifests/config.pp

@@ -0,0 +1,30 @@
+# == Class: keystone::config
+#
+# This class is used to manage arbitrary keystone configurations.
+#
+# === Parameters
+#
+# [*keystone_config*]
+#   (optional) Allow configuration of arbitrary keystone configurations.
+#   The value is an hash of keystone_config resources. Example:
+#   { 'DEFAULT/foo' => { value => 'fooValue'},
+#     'DEFAULT/bar' => { value => 'barValue'}
+#   }
+#   In yaml format, Example:
+#   keystone_config:
+#     DEFAULT/foo:
+#       value: fooValue
+#     DEFAULT/bar:
+#       value: barValue
+#
+#   NOTE: The configuration MUST NOT be already handled by this module
+#   or Puppet catalog compilation will fail with duplicate resources.
+#
+class keystone::config (
+  $keystone_config  = {},
+) {
+
+  validate_hash($keystone_config)
+
+  create_resources('keystone_config', $keystone_config)
+}