Comment 4 for bug 1642551

Reviewed: https://review.openstack.org/406634
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=6ef04176474e6b6034b4d4ae0081cb759eaa760b
Submitter: Jenkins
Branch: stable/newton

commit 6ef04176474e6b6034b4d4ae0081cb759eaa760b
Author: Harald Jensas <email address hidden>
Date: Thu Nov 17 15:37:10 2016 +0100

    No longer hard coding to a specifc network interface name.

    Instead of using a specific network interface name, thi fix
    fetch all ethernet mac addresses. Then uses this list of
    mac addresses to do a check if any entries in the list
    match any of the values in NetConfigDataLookup for a node.
    If there is a match, the /etc/os-net-config/mapping.yaml
    file for the node will be written.

    This fix removes the hard coded interface name 'eth0' used
    to get a mac address as identifyer for the specific node
    before. Using a hard coded interface name such as 'eth0'
    would have failed on most hardware because of "consistent
    network device names".

        Fix Bug: #1642551

    Change-Id: I6c1d1b4d70b916bc5d9049469df8221f8ab2eb95
    (cherry picked from commit 06d4d088adcceb6076017fb2a58b5a339232a6a3)