Merge "Wire in Controller pre-deployment extraconfig"

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diff --git a/puppet/extraconfig/pre_deploy/README b/puppet/extraconfig/pre_deploy/README
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+This tree contains additional configuration which happens "pre deployment",
+e.g before the OpenStack services themselves are configured but after the
+nodes themselves have been provisioned and initially configured.
+
+Typically for puppet deployments these additional configs will put in place
+hieradata which is then consumed by the subsequent puppet configuration
+which occurs during the post-deployment phase.
+
+If you need to specify multiple configs, you can chain them together in a
+template, see the multiple.yaml example:
+
+  OS::TripleO::ControllerExtraConfigPre: puppet/extraconfig/pre_deploy/controller/multiple.yaml