Add element to install config-applier

Change-Id: I91f519f5ecbe1c5a252e87af28b66eef983478b0

elements/config-applier/README.md

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+Installs config-applier to handle Heat Metadata based configuration of
+the system.

elements/config-applier/install.d/20-config-applier

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+#!/bin/sh
+
+home=$(dirname $0)
+set -uex
+
+mkdir -p /opt/stack
+cd /opt/stack
+git clone https://github.com/tripleo/config-applier.git
+cd config-applier
+git checkout master
+pip install -e . -U
+
+install -m 0644 -o root -g root $home/config-applier.upstart /etc/init/config-applier.conf

elements/config-applier/install.d/config-applier.upstart

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+start on runlevel [2345]
+
+task
+
+author "Clint Byrum <clint@fewbar.com>"
+description "Config Applier"
+
+exec config-applier