ML2 uses bulk support with drivers that don't support it

[Kevin Benton]

ML2 statically sets __native_bulk_support to True. However, some drivers do not support bulk operations so there should be a way to turn off bulk support when using those drivers.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/68996

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/68996
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=1027d02977812064b688fe0748c46663c1627cf2
Submitter: Jenkins
Branch: master

commit 1027d02977812064b688fe0748c46663c1627cf2
Author: Kevin Benton <email address hidden>
Date: Fri Jan 24 19:43:54 2014 +0000

    Base ML2 bulk support on the loaded drivers

    Changes the ML2 plugin bulk support flag to
    be based on the bulk support of the underlying
    drivers.

    Closes-Bug: #1272490
    Change-Id: I28281c9ecc1696b929c7e0125d02a37946948744