Port to Icehouse

Issues
* routing (ssh) to instances (floating IPs) only working from network0
* rc.local on network0 is not running to setup br-ex on reboot
  (but is OK after fresh bootstrap)
* instance networking in general not happy after vagrant halt/start
Merge branch 'icehouse'

Changes
* OpenStack Icehouse release
* Per tenant Neutron private networks with 'public' floating IP addrs
* noVNC URLs for instances are available to the host machine