Add tripleo-ansible to /opt/stack

This commit adds a diskimage-builder element that downloads the
tripleo-ansible repository to /opt/stack so it can be included in
deployed images.

Change-Id: I989ab54ee0d0a2afa581558eb969e6c48df95990

elements/tripleo-ansible/README.md

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+Install tripleo-ansible repository
+
+Configuration
+-------------
+
+At present, there is no configuration for this element.

elements/tripleo-ansible/element-deps

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+source-repositories
+ansible

elements/tripleo-ansible/install.d/tripleo-ansible-source-install/31-tripleo-ansible

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+#!/bin/bash
+#
+# Copyright 2014 Hewlett-Packard Development Company, L.P.
+# All Rights Reserved.
+#
+# 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.
+#
+
+set -eux
+set -o pipefail
+
+VENV=/opt/stack/venvs/ansible
+
+set +u
+source $VENV/bin/activate
+set -u
+
+$VENV/bin/pip install -r /opt/stack/tripleo-ansible/requirements.txt

elements/tripleo-ansible/source-repository-tripleo-ansible

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+tripleo-ansible git /opt/stack/tripleo-ansible https://github.com/SpamapS/tripleo-ansible.git