Integrate Contrail's ML2 Plugin with Gluon's ML2 Plugin for Gluon

Currently Gluon has completed its ML2 Plugin by subclassing Neutron's original Ml2Plugin code. Refer to https://blueprints.launchpad.net/python-gluon/+spec/gluon-ml2-plugin. Contrail also completed its own Ml2 Plugin. We need to integrate Contrail's ML2 Plugin code with Gluon's ML2 Plugin code so that the Gluon's ...