Remove unnecessary setUp methods

TrivialFix
Change-Id: I082d4eabdc4a50ba9af8a3b18d2f6641093c312e

nova/tests/functional/api_sample_tests/test_servers.py

@@ -519,9 +519,6 @@ class ServersSampleJson273Test(ServersSampleBase):
     microversion = '2.73'
     scenarios = [('v2_73', {'api_major_version': 'v2.1'})]
 
-    def setUp(self):
-        super(ServersSampleJson273Test, self).setUp()
-
     def _post_server_and_lock(self):
         uuid = self._post_server(use_common_server_api_samples=False)
         reason = "I don't want to work"

nova/tests/unit/api/openstack/compute/test_serversV21.py

@@ -2556,9 +2556,6 @@ class ServersControllerTestV273(ControllerTest):
     """
     wsgi_api_version = '2.73'
 
-    def setUp(self):
-        super(ServersControllerTestV273, self).setUp()
-
     def req(self, url, use_admin_context=False):
         return fakes.HTTPRequest.blank(url,
                                        use_admin_context=use_admin_context,

nova/tests/unit/virt/libvirt/volume/test_mount.py

@@ -170,9 +170,6 @@ class ThreadController(object):
 
 
 class HostMountStateTestCase(test.NoDBTestCase):
-    def setUp(self):
-        super(HostMountStateTestCase, self).setUp()
-
     @mock.patch('os.path.ismount',
                 side_effect=[False, True, True, True, True])
     def test_init(self, mock_ismount):