Changed layout for Quantum networking.

Added a netnode for running the L3 agents.
Separated mysql from common playbook
Added Quantum service user and urls to Keystone

Changed all services to listen on the controller's management IP.
But they should be changed to listen only on the appropriate IPs.
Updated Glance to use controller IP
Changed controller for Quantum

Removed the nova-network service.
Added Quantum url and credentials so Nova can use the Quantum API.
Commented out some nova-compute network settings in nova.conf.
Added Quantum service with OVS plugin to controller

Note: default /etc/quantum/quantum.conf seems ok for service
Added nova-compute without bridge-utils
Added playbook for Open vSwitch its Quantum plugin
Added Quantum L3 and DHCP agents

Also configures a br-ex bridge on the network node that the l3 agent uses
by default as a gateway to uplink Quantum routers to external networks.
Fixed missing nova-compute.conf

nova-compute would not start, with nothing except
"init: nova-compute main process (12368) terminated with status 1"
in syslog
Change qemu.conf cgroup_device_acl

Fixes "tap could not be initialised" on VM boot
Added Horizon