CA-126948: switch to using a generated MAC rather than letting XAPI handle this.
CA-126948: switch to using a generated MAC rather than letting XAPI handle this.

There is a very small chance that we might duplicate MACs, but given the likelyhood,
particularly as the VMs are being created/destroyed all the time, I do not think this
is a concern that warrants the work required to track MAC usage.

Signed-off-by: Rob Dobson <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@rdobson.co.uk>

rdobson/auto-cert-kit,bpwook/auto-cert-kit,xenserver/auto-cert-kit,bpwook/auto-cert-kit,vivekkumac/auto-cert-kit,xenserver/auto-cert-kit,vivekkumac/auto-cert-kit,rdobson/auto-cert-kit