see clone https://github.com/xebialabs/overcast/blob/master/src/main/java/com/xebialabs/overcast/support/libvirt/DomainWrapper.java
(clear-all-macs xml)
(clear-mac node)
(clear-uuid xml)
(clone-disks c name' root)
(clone-domain c domain)
(clone-name name' idx)
(interface? loc)
(ram? loc)
(set-cpu xml cpu)
(set-ram xml ram)
(vcpu? loc)
(version c)