Comment 5 for bug 1374663

Reviewed: https://review.openstack.org/154128
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=c717a6365c1aecb0e3957f0857a06f2334f99d5d
Submitter: Jenkins
Branch: master

commit c717a6365c1aecb0e3957f0857a06f2334f99d5d
Author: Matthew Thode <email address hidden>
Date: Mon Feb 9 11:02:58 2015 -0600

    replaces enumeration method used to get a list of interfaces

    ip_lib was parsing tunnel links incorrectly. We can create interface
    names with any character the filesystem supports (not '..', '/', ':').
    Given this we do not know what to delimit on so parsing iproute2 output
    is probably not a good idea.

    I asked the iproute2 devs what the proper way we should get interface
    names is and was told NOT to parse iproute2 output but to use something
    like sysfs instead. http://www.spinics.net/lists/netdev/msg316577.html

    This patch pulls interfaces from sysfs (/sys/class/net) and verifies them
    via checking if they are links (bonding creates files for instance and
    needs to be skipped).

    Currently it is not possible without jumping through a ton of hoops to
    access a network namespace without iproute2 or cython, so we use ip to
    run find to find the correct sysfs directory. We also only call out to
    iproute2 _ONLY_ if needed.

    Change-Id: I07d1d297f07857d216649cccf717896574aac301
    Closes-Bug: 1374663