Add ExtraConfig example that always runs on update

Some user feedback indicates we need better examples showing how
we can run an extraconfig template, e.g on post-deploy so that it
runs every update, regardless of if a change to the config has
occurred.  We can leverage DeployIdentifier for this, just like with
the puppet deployments.

This can be tested with an example like this:

resource_registry:
  OS::TripleO::NodeExtraConfigPost: tripleo-heat-templates/extraconfig/post_deploy/example_run_on_update.yaml

Change-Id: I45d8f8093ab45c03238ec56651c437128661cb95

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