Add standard puppet module files and .gitreview

This module has been split out from system-config, and additional
    files are added to create a proper puppet module.

    The spec:
    http://specs.openstack.org/openstack-infra/infra-specs/specs/puppet-modules.html

Change-Id: I6ecbfab1c2b23998a81c159be8c380c88ded8043

.gitreview

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+[gerrit]
+host=review.openstack.org
+port=29418
+project=openstack-infra/puppet-gerrit.git

README.md

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+# OpenStack Gerrit Module
+
+## Overview
+
+Install and configure Gerrit.

Rakefile

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+require 'rubygems'
+require 'puppetlabs_spec_helper/rake_tasks'
+require 'puppet-lint/tasks/puppet-lint'
+PuppetLint.configuration.fail_on_warnings = true
+PuppetLint.configuration.send('disable_80chars')
+PuppetLint.configuration.send('disable_autoloader_layout')
+PuppetLint.configuration.send('disable_class_inherits_from_params_class')
+PuppetLint.configuration.send('disable_class_parameter_defaults')

metadata.json

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+{
+  "name": "openstackci-gerrit",
+  "version": "0.0.1",
+  "author": "Openstack CI",
+  "summary": "Puppet module for Gerrit",
+  "license": "Apache 2.0",
+  "source": "git://git.openstack.org/openstack-infra/puppet-gerrit.git",
+  "project_page": "http://ci.openstack.org/",
+  "issues_url": "https://storyboard.openstack.org/#!/project/768",
+  "dependencies": [
+  ]
+}