fixes #1957 - remove old libvirt hypervisors code

Since foreman 1.0 libvirt hypervisors are now part of compute resources
this patch removes the old code and migrate any existing hypervisors to
be libvirt based compute resources.

fixes #832 - adds parameterized class support

Credits:
This patch is based on the original work of Olivier Favre
<olivier@yakaz.com> many many thanks!

• import class parameters, and try to understand their types
• support a complex matrix of environments, puppet classes and their...

fixes #1463 - let Foreman run on a sub path

e.g. for it being available on http://localhost:3000/foreman you run:

RAILS_RELATIVE_URL_ROOT=/foreman rails s

fixes #1649 Puppet class and environment import works only on the first smart-proxy

adds ec2 provisioning support fixes #1223

- added progress bar for instance creation
- minor fixes for certname based deployments
- added ssh provisioning support to orchestartion, which utilize finish
scripts by default
- added images support (part of the vm compute tab)...

fixes #1540 added suport for provisioning on ovirt/rhvem using fog.

This patch addes a compute resource concept within foreman

Signed-off-by: Ohad Levy <ohadlevy@gmail.com>

code smell

fixes #1509 - Foreman should use the proxy to import puppet classes

fixed issues with newer version of virt, reusing the newer gem

fixes #1476 - toggling between bare metal to an hypervisor renders js errors