In order to improve the readability and robustness of the mnaio feature
I have replaced the shell out to virsh tasks to use the virt module
where available. I have also created a vm-status play that will
hopefully help resolve SSH failures into the VMs. This play utilizes
the block/rescue/handler pattern to attempt to restart the VM once if
it fails the initial SSH check. Hopefully this will reduce the SSH
failures due to a suck VM. This adds a new variable called
vm_ssh_timeout which allows the deployer an easy place to override the
default timeout. The python-lxml package is needed for the virt module.
Change-Id: I027556b71a8c26d08a56b4ffa56b2eeaf1cbabe9
482e845d92