modules/smartos_vmadm : add vm_info(uuid), vm_virt_type(uuid)

Two more functions to the SmartOS vmadm command :

* vm_info(uuid) : outputs the full JSON for the specified VM

* vm_virt_type(uuid) : helper which returns the type of virtualization
  (KVM or OS). This will help other functions to adapt their
  behaviour.
Merge pull request #5304 from virtua-network/vmadm

modules/smartos_vmadm : add vm_info(uuid), vm_virt_type(uuid)