Initial Modular L2 Mechanism Driver implementation.

[OpenStack Infra]

https://review.openstack.org/33201
commit a4cd238e18d0076aa18a21301b16d8fb80ce43c6
Author: Andre Pech <email address hidden>
Date: Mon Jul 1 18:08:27 2013 -0700

    Initial Modular L2 Mechanism Driver implementation.

    Define the Mechanism Driver interface for create/update/delete
    operations on networks and ports. For each of these event, the
    Mechanism Driver provides one method that is called within the
    database transaction of the ml2 plugin method, and one that is called
    after the transaction is completed.

    Support for mechanism drivers is still a work-in-progress, and the
    interface is subject to change in future versions before the release
    of Havana. However this initial version should be sufficient to enable
    others to start defining their own mechanism drivers.

    Change-Id: Ife30215589792ee27df9897d3b2bc04392638266
    Implements: blueprint ml2-mechanism-drivers
    DocImpact

[Andreas Jaeger (jaegerandi)]

The ML2 driver is now documented in the manuals, marking this as fixed.