Stack update preview breaks for Neutron port resource

[Jason Dunsmore]

To reproduce:

1. Create a stack with http://paste.openstack.org/raw/489377/

heat stack-create -f http://paste.openstack.org/raw/489377/ repro

2. Do a stack update preview with no changes:

heat stack-update --dry-run -f http://paste.openstack.org/raw/489377/ repro

Result:

ERROR: Remote error: NeutronClientNoUniqueMatch Multiple network matches found for name '', use an ID to be more specific.
[u'

This was fixed by: https://github.com/openstack/heat/commit/0388da504765f9975aeadc509672c0a47bbcc244

But that was reverted because it broke the Magnum gate: https://github.com/openstack/heat/commit/71be639c226067f6bc7b8528bd44e15806a5732b

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/280045
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=2e637091f3bb183bb4bde0d0838a609942a1b6b4
Submitter: Jenkins
Branch: master

commit 2e637091f3bb183bb4bde0d0838a609942a1b6b4
Author: Rabi Mishra <email address hidden>
Date: Tue Jan 5 17:19:52 2016 +0530

    Resolve name/id using translation rules

    This changes the first set of neutron resouces to
    use translation rules to resolve name_id properties.

    Changed reources:

    - OS::Neutron::Subnet
    - OS::Neutron::Port
    - OS::Neutron::Router
    - OS::Neutron::FloatingIp

    Change-Id: I13f30abb5e284beff4ece9e0c88ee7319ff1be80
    Partial-Bug: #1514680
    Closes-Bug: #1553362

[Thierry Carrez (ttx)]

This issue was fixed in the openstack/heat 6.0.0.0rc1 release candidate.