Linux bridge create by the OVS hybrid vif driver sends IGMP query

[Édouard Thuleau]

The Linux bridge (qbr) created by the OVS hybrid vif driver sends usefulness IGMP queries.
By default, Linux bridge activates IGMP snooping onto a switch.

In the case of the Linux bridge was created by the OVS hybrid vif driver, is usefulness.
Because this bridge is only here to be able to apply security groups through netfilter (OVS bridge doesn't use netfilter hooks) and so it contains only 2 interfaces: the VM tap and a side of the veth patch port.
IGMP snooping on a switch of 2 ports is unnecessarily.

Furthermore, the Linux bridge could (I didn't find why and when) send some IGMP queries when the IGMP snooping is activated.
This IGMP queries could unnecessarily pollute the network and the network equipemnts log.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/70945
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=f591eee475df177fef5f10898b2d95c1a75f5563
Submitter: Jenkins
Branch: master

commit f591eee475df177fef5f10898b2d95c1a75f5563
Author: Édouard Thuleau <email address hidden>
Date: Tue Feb 4 11:16:58 2014 +0100

    Disable IGMP snooping on hybrid Linux bridge

    By default, Linux bridge activates the IGMP snooping on his switch.
    It is unnecessarily on Linux bridge created by OVS/VIF hybrid vif
    drivers because that switch is limited two ports.

    That patch also refactoring OVS and IVS plug and unplug unit tests of the
    hybrid drivers.

    Closes-Bug: #1276038
    Change-Id: Ib8bb1874d7a300fddffdc76ba67851109248bebf