remove ovs dependency in embrane plugin

[Ignacio Scopetta]

The OVS core plugin will be removed in Juno 2 but the embrane plugin code is still using it and will stop working.
This bug tracks changing the dependency to ML2

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/108226

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/108226
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=6186e0cabe5ba854cddd68351e314933f826ee33
Submitter: Jenkins
Branch: master

commit 6186e0cabe5ba854cddd68351e314933f826ee33
Author: Ignacio Scopetta <email address hidden>
Date: Sat Jul 19 23:37:22 2014 -0700

    Remove ovs dependency in embrane plugin

    This patch changes the dependency of the embrane plugin from ovs to ml2.
    Existing users of the old entry point will be upgraded on a case-by-case
    base as needed, therefore no generic upgrade procedure is required.

    Change-Id: Id192fc32bd6ba7a8926eff1190070b8df5327129
    Closes-Bug: #1343024