Multiple unit tests generate errors when run on a machine with nova services running

./run_tests.sh -V generated 50 errors and 1 failure when executed on a node that also has several nova services running (nova-api, nova-network, nova-scheduler, nova-objectstore). When run on a node without these services, all tests pass.

I haven't investigated too closely, but the errors look like collisions with existing services (e.g., trying to listen on a port already in use).

Revision: 1054
OS: SLES 11SP1

Example of one such error:

~/nova/trunk> ./run_tests.sh -V nova.tests.integrated.test_extensions:ExtensionsTest.test_get_foxnsocks
ExtensionsTest
    test_get_foxnsocks ERROR

======================================================================
ERROR: test_get_foxnsocks (nova.tests.integrated.test_extensions.ExtensionsTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/lorin/nova/trunk/nova/tests/integrated/integrated_helpers.py", line 163, in setUp
    self.auth_url = self._start_api_service()
  File "/home/lorin/nova/trunk/nova/tests/integrated/integrated_helpers.py", line 172, in _start_api_service
    api_service.start()
  File "/home/lorin/nova/trunk/nova/service.py", line 238, in start
    self.wsgi_app = _run_wsgi(self.conf, self.apis)
  File "/home/lorin/nova/trunk/nova/service.py", line 330, in _run_wsgi
    server.start(*app)
  File "/home/lorin/nova/trunk/nova/test.py", line 177, in _wrapped_start
    self.original_start(inner_self, *args, **kwargs)
  File "/home/lorin/nova/trunk/nova/wsgi.py", line 67, in start
    socket = eventlet.listen((host, port), backlog=backlog)
  File "/home/lorin/nova/trunk/.nova-venv/lib/python2.6/site-packages/eventlet/convenience.py", line 37, in listen
    sock.bind(addr)
  File "<string>", line 1, in bind
error: [Errno 98] Address already in use