Openstack Havana in eqiad, baby step:

- Upgrade nova controller on virt1000 to havana
- Install nova compute nodes on virt1001, 1002 1003
- Add havana config files (so far c/p from folsom)
- Configure labsnet2 with nova-network

That last bit is a temporary measure, as soon labsnet2 should
use neutron instead.

Change-Id: I3da83579b434073817af357f34e0e3503a7d97b8