commit c227446f15c91cd157d60cac1c2f35437df42de9
Author: mathieu-rohon <mathieu.rohon@gmail.com>
Date:   Mon Jun 17 17:56:14 2013 +0200

    Add gre tunneling support for the ML2 plugin

    This patch add the type_driver GRE to enable the creation of GRE
    tunnels with the OVS agent.
    No Endpoints ID are managed. Only Endpoint IP are stored in DB,
    and this IP is proposed as an endpoint ID for the OVS agent.

    Implements: blueprint ml2-gre
    bug : 1201471
    Change-Id: I1a33a4bd3ebc4c97eecf17a59ce16b8c2066ec66