Comment 5 for bug 1779626

Reviewed: https://review.openstack.org/580188
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=509e0a030397887b9d77729f5e4a356b9fe2a24e
Submitter: Zuul
Branch: stable/queens

commit 509e0a030397887b9d77729f5e4a356b9fe2a24e
Author: Sahid Orentino Ferdjaoui <email address hidden>
Date: Mon Jul 2 17:42:05 2018 +0200

    libvirt: add qemu version check when configuring mtu for network

    This adds a QEMU check when configuring MTU for ethernet and bridge
    interface types. When creating and configuring tap devices, libvirt is
    setting MTU but also configures the virtio-net devices to let it
    discovers the MTU used. This QEMU 'host_mtu' option is supported by
    QEMU version 2.9 and more.

    Closes-Bug: 1779626
    Change-Id: I55cf259c715ba129fa8479d1e8a0d11ec15aaa43
    Signed-off-by: Sahid Orentino Ferdjaoui <email address hidden>
    (cherry picked from commit e2d7189f4ff7e4a2697256cf3f695327e1d71db2)