Add Mistral event engine

Mistral has an event engine for triggering cron events. Let's run it.

Change-Id: I386e0b77064ca6938af36238f82bfec010aa5a17
Depends-On: Icaef5e5732f98e9cc39ed1f024d715cee371acac

diff --git a/manifests/profile/base/mistral/event_engine.pp b/manifests/profile/base/mistral/event_engine.pp
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+# Copyright 2017 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# == Class: tripleo::profile::base::mistral::event_engine
+#
+# Mistral Event Engine profile for tripleo
+#
+# === Parameters
+#
+# [*bootstrap_node*]
+#   (Optional) The hostname of the node responsible for bootstrapping tasks
+#   Defaults to hiera('bootstrap_nodeid')
+#
+# [*step*]
+#   (Optional) The current step in deployment. See tripleo-heat-templates
+#   for more details.
+#   Defaults to hiera('step')
+#
+class tripleo::profile::base::mistral::event_engine (
+  $bootstrap_node = hiera('bootstrap_nodeid', undef),
+  $step           = hiera('step'),
+) {
+  if $::hostname == downcase($bootstrap_node) {
+    $sync_db = true
+  } else {
+    $sync_db = false
+  }
+
+  include ::tripleo::profile::base::mistral
+
+  if $step >= 4 or ($step >= 3 and $sync_db)  {
+    include ::mistral::event_engine
+  }
+
+}

diff --git a/releasenotes/notes/add-mistral-event-engine-05097cb76834f09d.yaml b/releasenotes/notes/add-mistral-event-engine-05097cb76834f09d.yaml
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+---
+features:
+  - Add support for Mistral event engine.
+