run_tests.sh doesn't work on stable/havana branch

[Ian Wienand]

On stable/havana branch, ./run_tests.sh launches a huge ridiculously long error string which comes down to

---
[iwienand@fedora19 neutron]$ .venv/bin/python -c "from neutron.plugins.linuxbridge.agent import linuxbridge_neutron_agent"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "neutron/plugins/linuxbridge/agent/linuxbridge_neutron_agent.py", line 33, in <module>
    import pyudev
ImportError: No module named pyudev
---

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/havana
Review: https://review.openstack.org/86506

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/86506
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=ac8c83653bad3f9d91dd539271d110e3f5dc5e04
Submitter: Jenkins
Branch: stable/havana

commit ac8c83653bad3f9d91dd539271d110e3f5dc5e04
Author: Darragh O'Reilly <email address hidden>
Date: Tue Jan 14 15:02:17 2014 +0000

    Remove pyudev dependency

    pyudev was only used by the linuxbridge-agent to get the list
    of virtual network devices. This can be got from /sys instead.
    This patch fixes the problem where testr could not import the
    lb-agent module because pyudev was not in requirements.txt.

    Cherry-picked from dfa4112400173d2fc1c9bbe2bc8028d720fd7168

    Change-Id: I0a78c91e97de4413f2ecf6fb56d2ff61b36baa78
    Closes-Bug: 1269040
    Closes-Bug: 1305428