Rearrange labs-ns servers.

The old labs-ns0 (virt0) goes away.

The old labs-ns1 (virt1000) becomes labs-ns0

The old labs-ns2 (labcontrol2001) becomes labs-ns1

Change-Id: Id38490f1f004e8d63dc26b59f123b3b30a723056
Merge "Rearrange labs-ns servers."