Unittest case pollutes httplib

[Huang Zhiteng]

The unittest in 'tests/api/openstack/compute/test_limits.py' pollutes the httplib/httplib2 usage in later test cases.

To reproduce this bug:

1) put following code into test_httplib.py
----------------------
import httplib2

from nova import test

class HttplibTest(test.TestCase):
    def test_httplib(self):
        http = httplib2.Http()
        response, content = http.request("http://127.0.0.1", 'GET')
        self.assertEqual(response.status, 200, 'Httplib Test')
-----------------------

2) run this test after api/openstack/compute/test_limits.py like this:
./run_tests.sh api/openstack/compute/test_limits.py test_httplib

Following error should occur:
======================================================================
ERROR: test_httplib (nova.tests.test_1.HttplibTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/zhiteng/stack/nova/nova/tests/test_1.py", line 26, in test_httplib
    response, content = http.request("http://127.0.0.1", 'GET')
  File "/opt/stack/nova/.venv/lib/python2.7/site-packages/httplib2/__init__.py", line 1428, in request
    proxy_info=proxy_info)
  File "/opt/stack/nova/.venv/lib/python2.7/site-packages/httplib2/__init__.py", line 852, in __init__
    httplib.HTTPConnection.__init__(self, host, port, strict)
TypeError: __init__() takes exactly 2 arguments (5 given)

----------------------------------------------------------------------

The root cause should be the 'wire_HTTPConnection_to_WSGI' function, which wrap httplib.HTTPConnection to FakeHttpConnection but doesn't clean up when finished.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/8462

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/8462
Committed: http://github.com/openstack/nova/commit/cbd334d0a8b12bb78ff40a4bdc696a80fa6a393a
Submitter: Jenkins
Branch: master

commit cbd334d0a8b12bb78ff40a4bdc696a80fa6a393a
Author: Eric Harney <email address hidden>
Date: Tue Jun 12 21:23:47 2012 -0400

    Unwrap httplib.HTTPConnection after WsgiLimiterProxyTest.

    Fixes bug 1007307.

    Change-Id: I0b84d29a86a727b611f60f6be15a6d0d21c17a4b