Add L3, LBaaS, and FWaaS drivers

[Kyle Mestery]

We need to add the L3, LBaaS, and FWaaS drivers from Dave Tucker's github [1] project into the networking-odl project. This would simply be taking the existing drivers from there, adding them in, and adding unit test coverage.

[1] https://github.com/dave-tucker/odl-neutron-drivers

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/147306

[Patrick Laurin (plaurin)]

WIP

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/147306
Committed: https://git.openstack.org/cgit/stackforge/networking-odl/commit/?id=f8058c0d57acdcede8360f8c9c24f7461211cf19
Submitter: Jenkins
Branch: master

commit f8058c0d57acdcede8360f8c9c24f7461211cf19
Author: Patrick Laurin <email address hidden>
Date: Wed Jan 14 11:06:19 2015 -0500

    This adds existing L3, LBaas and FWaaS drivers

    Drivers are from dave-tucker's odl-neutron-drivers
    repository (see Bug description for link)

    Co-Authored-By: Dave Tucker <email address hidden>
    Change-Id: I359a8d4b2b1817e531c784ee54bab1621bf60fbf
    Closes-bug: #1410330