Comment 1 for bug 1533652

Reviewed: https://review.openstack.org/266894
Committed: https://git.openstack.org/cgit/openstack/fuel-main/commit/?id=64f89160a361967e4ea32d12c25c6a14c72a01ba
Submitter: Jenkins
Branch: master

commit 64f89160a361967e4ea32d12c25c6a14c72a01ba
Author: alexz <email address hidden>
Date: Wed Jan 13 14:54:40 2016 +0200

    Fix 'adminf' fetching logic

     * Backup ifcfg-* files, not remove
     * Backup ifcfg-* file only if its really needed
     * Check for existing ID_NET_NAME_ONBOARD, ID_NET_NAME_SLOT, ID_NET_NAME_PATH
       (in order) in sys net class, and chose first one.

    In case of real hardware, anaconda can spawn dracut with ID_NET_NAME_ONBOARD
    nic naming. Otherwise, our "Advanced install" logic fetch nic.name by another
    key. Its totally brake "Advanced install" feature

    Closes-bug: #1533652
    Partial-bug: #1533239

    Change-Id: I18d8a8350f134c73dc7a83202facf6ee7b4fc6f9