Add uuid to facts

For physical HW that would be unique chassis id (from BIOS settings).
For kvm guests that would be virsh domain uuid. Used with fence_virsh agent.
For other hypervizors - not tested.

Implements: blueprint facter-uuid

Change-Id: Idd92a3e0dc41040c76243f92fa84e14b9da03b6d
Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>