Quantum porting of nova's VLAN network manager

The aim of this plugin is to provide:
- an implementation of the Quantum API which will work across all the hypervisors supported by the compute service
We will at first support KVM, Xen, and ESX - and then extend support to Hyper-V when it will become more mature from the compute side
- a solution for installing Quantum without requiring specialized hardware or additional software
This will also help packaging and distributing Quantum without additional dependencies

This plugin will provide 'simple' network isolation with VLANs, as the nova VLAN network manager currently does.
IP address management, VPN access, and Floating IPs are outside the scope of this blueprint, which is aimed at implementing exclusively the Layer-2 part of the VLAN network manager for quantum.

More details in slides from the summit:
http://www.slideshare.net/SalvatoreOrlando1/quantum-basic-vlan-plugin

In other words, the plugin proposed with this blueprint will be functionally equivalement to the OVS plugin (https://blueprints.launchpad.net/quantum/+spec/quantum-openvswitch-plugin) , with the only difference being that it will use hypervisor-specific drivers instead of Open vSwitch.
This will enable Quantum to be used over a wide range of hypervisors, including ESX and possibly hyper-V.