Allow to use network label in nova_fixed format

[Cedric Brandily]

Allow to use fixed_ip network label when using nova_fixed handler

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/175451

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/175451
Committed: https://git.openstack.org/cgit/openstack/designate/commit/?id=13f1584d092abe63a2714438ebe65460ff22f5de
Submitter: Jenkins
Branch: master

commit 13f1584d092abe63a2714438ebe65460ff22f5de
Author: Cedric Brandily <email address hidden>
Date: Mon Apr 20 17:32:14 2015 +0200

    Allow to use network label in nova_fixed handler format

    Nova notifications provide network label per fixed_ip in create
    payloads. This change updates code to allow nova_fixed handler format
    to use the key "label" providing network label. The format:

     %(instance_name)s.%(label)s.%(domain)s

    returns the fqdn:

     instanceXX.netYY.domainZZ

    for instanceXX on netYY with domainZZ as nova_fixed handler domain.

    Change-Id: I7ffef6464ab5e8e8f1e74dca8fcff972c2ad6d58
    Closes-Bug: #1446242