Remove network_device_mtu option

[Ihar Hrachyshka]

Since Mitaka, Neutron may use network resource MTU as long as network_device_mtu is not set. The latter option is deprecated since Mitaka. We should remove it.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/342958

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/342958
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=a9133b7255355942a386756ef98df0bee6f0c33b
Submitter: Jenkins
Branch: master

commit a9133b7255355942a386756ef98df0bee6f0c33b
Author: Ihar Hrachyshka <email address hidden>
Date: Fri Jul 15 18:14:12 2016 +0200

    Remove deprecated network_device_mtu option

    The right way to configure Neutron to work with infrastructure MTU is by
    using plugin agnostic global_physnet_mtu and ml2 specific
    path_mtu/physical_network_mtus options. The deprecated option is error
    prone and does not allow to use different MTUs per network.

    Closes-Bug: #1603493
    Related-Bug: #1549470
    Related-Bug: #1542108
    Related-Bug: #1542475

    DocImpact Remove all references to network_device_mtu option from
              Neutron documentation. Note that Nova has a deprecated option
              with the same name that will need a separate patch to be removed.

    Depends-On: I8e6cc99fe70d0c41a705431fb3160e8fccacff10
    Depends-On: I337b284076a794027fbd63796119d56bd1923cf2
    Change-Id: I7287db9df25a78a59b2dfa28acfde7fe69d17f40

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 9.0.0.0b3 development milestone.