Katello Deploy now with Capsules

For anyone that uses katello-deploy to deploy environments, we've added
support for deploying a fully deployed and registered Capsule environment.
Master should now should options for 3.0 and nightly and allow the use of
custom boxes to deploy multiple capsules. This currently is only supported
against production installs but we will be looking into setups against
devel boxes.

Thanks to Ivan, Stephen and Ewoud for reviews, code contributions and

··· -- Eric D. Helms Red Hat Engineering Ph.D. Student - North Carolina State University