Update openvswitch tunnel unittest

[Aaron Rosen]

I forgot to update the unit test for openvswitch when the following patch was committed: https://github.com/openstack/quantum/commit/e702264e310714a2369713fad95264d3ccedb66b

This causes the following error when running the unittests:

======================================================================
ERROR: testPortBound (quantum.plugins.openvswitch.tests.unit.test_tunnel.TunnelTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/opt/stack/quantum/quantum/plugins/openvswitch/tests/unit/test_tunnel.py", line 132, in testPortBound
    a.port_bound(VIF_PORT, NET_UUID, LS_ID)
  File "/opt/stack/quantum/quantum/plugins/openvswitch/agent/ovs_quantum_agent.py", line 351, in port_bound
    if int(port.ofport) != -1:
ValueError: invalid literal for int() with base 10: 'ofport'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/10284

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/10284
Committed: http://github.com/openstack/quantum/commit/ef6af3e3d2da3e1483b201b98b06c4555e90f6e7
Submitter: Jenkins
Branch: master

commit ef6af3e3d2da3e1483b201b98b06c4555e90f6e7
Author: aaronorosen <email address hidden>
Date: Wed Jul 25 13:35:28 2012 -0400

    Update openvswitch tunnel unittest

    Bug #1029024

    Change-Id: Ie37ef0c3355e86f504fa71417921bb828b40e347