unit test fails on machines that don't have eth0

[Mark McClain]

The unit tests assume that a machine will have eth0. This will cause failures on systems that use other identifiers.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/20259

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/20259
Committed: http://github.com/openstack/quantum/commit/0bc4588692314d2c1cbba22590ec0e2737ef1e4c
Submitter: Jenkins
Branch: master

commit 0bc4588692314d2c1cbba22590ec0e2737ef1e4c
Author: Mark McClain <email address hidden>
Date: Tue Jan 22 12:16:09 2013 -0500

    make IPv6 unit test work on systems with eth0

    fixes bug 1103074

    The link local unit test was failing because it depended on eth0 to
    exists. This mocks getaddrinfo() to ensure a consistent return value
    across testing environments.

    Change-Id: Ie1a4d837efcacac8c8d2217c164ad751922e1a5f