Move audit into its own folder

This is the start of a cleanup of some of the audit middleware code.

The test changes are because this reorders the test execution order and
some of the global project tests were setting long lasting state.

Change-Id: I7a5576c1f497b9a43420f66c9e511cf6f280b62e

keystonemiddleware/tests/unit/auth_token/test_auth_token_middleware.py

@@ -29,7 +29,6 @@ from keystoneauth1 import session
 from keystoneclient.common import cms
 from keystoneclient import exceptions as ksc_exceptions
 import mock
-from oslo_config import cfg
 from oslo_serialization import jsonutils
 from oslo_utils import timeutils
 import pbr.version
@@ -2522,7 +2521,8 @@ class TestAuthPluginUserAgentGeneration(BaseAuthTokenMiddlewareTest):
         ksm_version = uuid.uuid4().hex
 
         conf = {'username': self.username, 'auth_url': self.auth_url}
-        with mock.patch.object(cfg.CONF, 'project', new=project, create=True):
+        with mock.patch.object(self.cfg.conf, 'project',
+                               new=project, create=True):
             app = self._create_app(conf, project_version, ksm_version)
         project = '{0}/{1} '.format(project, project_version)
         self._assert_user_agent(app, project, ksm_version)
@@ -2543,8 +2543,7 @@ class TestAuthPluginUserAgentGeneration(BaseAuthTokenMiddlewareTest):
         with mock.patch('keystonemiddleware._common.config.pkg_resources',
                         new=fake_pkg_resources):
             with mock.patch(at_pbr, new=fake_pbr_version):
-                return self.create_simple_middleware(body=body, conf=conf,
-                                                     use_global_conf=True)
+                return self.create_simple_middleware(body=body, conf=conf)
 
     def _assert_user_agent(self, app, project, ksm_version):
         sess = app._identity_server._adapter.session