Add custom facts for node.uuid, node.virsh_name

These facts will show virsh domain uuid & name for fence_virsh etc, if virtual;
otherwise will show system uuid (dmi.system.uuid), if any.

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Workaround libvirt gem missing at bootstrap, fix kvm node ip

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>