Introduce profile to configure l2 gateway Neutron agent.

Implements: blueprint l2gw-service-integration

Change-Id: If1501c153b1b170b9550cb7e5a23be463fba1fe9

manifests/profile/base/neutron/agents/l2gw.pp

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+#
+# Copyright (C) 2017 Red Hat Inc.
+#
+# Author: Peng Liu <pliu@redhat.com>
+#
+# 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::neutron::agent::l2gw
+#
+# Neutron L2 Gateway agent profile for TripleO
+#
+# === Parameters
+#
+# [*step*]
+#   (Optional) The current step in deployment. See tripleo-heat-templates
+#   for more details.
+#   Defaults to hiera('step')
+#
+class tripleo::profile::base::neutron::agents::l2gw (
+  $step = hiera('step'),
+) {
+  if $step >= 4 {
+    include ::neutron::agents::l2gw
+  }
+}

releasenotes/notes/l2gw_agent_support-2bc24b539da738a8.yaml

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+---
+features:
+  - Add support for l2 gateway Neutron agent support.