Proxy PuppetDB Performance Dashboard

Add new Feature:  Access the PuppetDB Performance Dashboard through Foreman with permissions.

PuppetDB Dashboard only runs on http and is not very secure or easy to give access to natively.
This allows tight control through Foreman over ssl.
Please use && and || ->  http://devblog.avdi.org/2010/08/02/using-and-and-or-in-ruby/