Change to set the container network MTU

[OpenStack Infra]

https://review.openstack.org/204796
commit 8cf1f44c9e9cd2304b8a1ad41282f2e993894632
Author: kevin <email address hidden>
Date: Wed Jul 22 19:06:57 2015 -0500

    Change to set the container network MTU

    This change adds the container network MTU option within the container
    network LXC config file. This will allow a deployer to set the MTU within
    a provider networks entry in openstack_user_config.yml.

    Example:

      ....
      provider_networks:
        - network:
            container_bridge: "br-storage"
            container_type: "veth"
            container_interface: "eth2"
            ip_from_q: "storage"
            type: "raw"
            container_mtu: "9000"
            group_binds:
              - glance_api
              - cinder_api
              - cinder_volume
              - nova_compute
              - swift_proxy

    This changes gives the deployer the ability to selectively set the mtu as
    needed.

    The dynamic_inventory.py script has been updated to allow for the MTU entry.

    Example file documentation has been added to show how to use this new setting.

    BackportPotential
    DocImpact
    Closes-Bug: #1477346

    Change-Id: If8c0ee042d2f1322f8322ea6c8ee33606070d880

[Karin Levenstein (karin-levenstein)]

This bug can be closed. The only documentation change required is to add an inline annotation to the example config file, and that was already done.