Add a delorean-repo element

This element allows developers to use Yum repositories
generated via the Delorean tool. This is very useful
for testing upstream packages with TripleO element changes.

Change-Id: I290f1adc9631c1350b0cb7ad52b27b6759de05d8

elements/delorean-repo/README.md

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+Configure the image to pull packages from a Delorean repo
+
+This element configures the image such that it downloads
+packages from the specified Delorean repository. To use set
+DELOREAN\_REPO\_URL to the Delorean repo you'd like to use.
+This can be 'current' or any revision in the past that you'd
+like to use. Example:
+
+ export DELOREAN\_REPO\_URL=http://localhost/~user/repos/current
+
+Delorean is a tool that can be used to automate building upstream
+packages:
+
+ https://github.com/openstack-packages/delorean
+
+The Delorean tool currently supports Fedora packages and Yum
+repositories. Support for other distributions may be added in
+the future.

elements/delorean-repo/element-deps

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+pkg-map

elements/delorean-repo/pkg-map

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+{
+  "default": {
+    "yum_plugin_priorities_package": "yum-plugin-priorities"
+  }
+}

elements/delorean-repo/pre-install.d/01-delorean-repo

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+#!/bin/bash
+set -e
+set -o xtrace
+
+if [ -n "$DELOREAN_REPO_URL" ]; then
+  curl $DELOREAN_REPO_URL/delorean.repo -o /etc/yum.repos.d/delorean.repo
+else
+  echo "Please configure a DELOREAN_REPO_URL."
+  exit 1
+fi

elements/delorean-repo/pre-install.d/03-install-yum-priorities

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+#!/bin/bash
+set -e
+set -o xtrace
+
+install-packages -m delorean-repo yum_plugin_priorities_package