virt functional tests and testing improvements

[Antoni Segura Puimedon]

Hi Everybody,

We are readying the way to run the virt functional tests as a jenkins job. In
order to achieve that, we'd like to be able to reboot one of the hosts holding
the jenkins slave VMs so that the setting "option kvm_intel nested=1" (This
is required because virt functional tests spawn a few VMs). It would also be
necessary to have a vdsm hook for the VM creation that puts the vmx capability
on the guests XML.

A related improvement would be to be able to have some guide for adding one's
hosts to jenkins as slaves for extra cycles and maybe to have some dedicated
slaves for complex testing setups.

Best regards,

Toni