Comment 4 for bug 1590101

Reviewed: https://review.openstack.org/333333
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=ecc4e4113671e2197efe908f0fd77da894fb5fef
Submitter: Jenkins
Branch: stable/mitaka

commit ecc4e4113671e2197efe908f0fd77da894fb5fef
Author: Brent Eagles <email address hidden>
Date: Wed Jun 22 14:46:25 2016 -0230

    Properly direct MTU parameters and allow service defaults

    This patch wires NeutronTenantMtu to path_mtu instead of the deprecated
    network_device_mtu. This maintains similar behavior but allows
    global_physnet_mtu to be set independently. The default for this
    parameter has also been changed to an empty string, allowing proper
    service defaults that enable Neutron's MTU logic to be used.

    This patch also sets the default for NeutronDnsmasqOptions to an empty
    string and introduces handling of empty values when creating the dnsmasq
    configuration file.

    Note that is a Mitaka only patch. The properties were completely removed
    in Newton in change I540ba5dc69d0506f71b59746efcce94c73f9317f.

    Closes-Bug: 1590100
    Closes-Bug: 1590101

    Change-Id: I6d12a2b741b4a81bf60f47fd553b7f71cd25b1c1