Invalid status code assertion after handle expected exception

[Alex Xu]

def test_create_two_subnets_same_cidr_returns_400(self):
        gateway_ip_1 = '10.0.0.1'
        cidr_1 = '10.0.0.0/24'
        gateway_ip_2 = '10.0.0.10'
        cidr_2 = '10.0.0.0/24'
        with self.network() as network:
            with self.subnet(network=network,
                             gateway_ip=gateway_ip_1,
                             cidr=cidr_1):
                with testtools.ExpectedException(
                        webob.exc.HTTPClientError) as ctx_manager:
                    with self.subnet(network=network,
                                     gateway_ip=gateway_ip_2,
                                     cidr=cidr_2):
                        pass
                    <! ---------------- Because self.subnet raise the exception, then will exit the with block, so code never can reach at here' ---------------->
                    self.assertEqual(ctx_manager.exception.code, 400)

There are many test-case like this using 'testtools.ExpectedException' and with invalid status code assertion.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/28918

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/28918
Committed: http://github.com/openstack/quantum/commit/4184d30458a2eae46c2ec4db6fca26e57a8a2353
Submitter: Jenkins
Branch: master

commit 4184d30458a2eae46c2ec4db6fca26e57a8a2353
Author: He Jie Xu <email address hidden>
Date: Mon May 13 10:26:09 2013 +0800

    Fix invalid status code assertion after handle expected exception

    Fix bug 1179350

    Change-Id: I88b511206d97f2ad607a7889c61df69a8638ced3