fixes #1452 use fog for libvirt management

This patch introduces a few new features:

• console support
• multiple disks
• multiple nics

first go at vmware integeration refs #955

this patch adds the ability to add a vmware compute resource, and display their console

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>