Comment 8 for bug 1542108

Reviewed: https://review.openstack.org/284814
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=ae45cd5732b8b75a5b2d35df555f46e11145eb85
Submitter: Jenkins
Branch: master

commit ae45cd5732b8b75a5b2d35df555f46e11145eb85
Author: Kevin Benton <email address hidden>
Date: Tue Feb 23 13:11:40 2016 -0800

    Add global_physnet_mtu and deprecate segment_mtu

    Introduce the neutron-wide 'global_physnet_mtu' option that
    references the underlying physical network MTU. This also
    introduces a method in plugin.common.utils that all plugins
    should use to retrieve it. This value should be used to
    calculate the proper MTU for virtual network components.

    This patch also deprecate the 'segment_mtu' option specific
    to the ML2 plug-in and makes ML2 reference this new option.

    Closes-Bug: #1542475
    Closes-Bug: #1542108
    Change-Id: I6ffc8973c9b8f46cc19922ff04fdd2d23646b878