Foreman » Installer

fixes #4988 - missing token in post_sync_url

Adding ability to configure whether passenger is being used to make
the Katello vhost configuration re-usable by non-passenger deployments.
Includes generalization of oauth_secret and oauth_key to support deployment
of katello.yml by other modules.

Removing unused templates, references to /usr/share/katello and adding
new parameter declarations for backend service modules.