Remove unnecessary setUp function in testcase

In testcase, setUp will be called automatically. This patch used to
remove setUp functions that do nothing. Besides, it will keep code clean.

Change-Id: I94c756ab0ee9d6ac0eac57b509473c509e3b46ba

zun/tests/unit/container/os_capability/linux/os_capability_linux/test_os_capability_linux.py

@@ -40,9 +40,6 @@ LSCPU_NO_ONLINE = """# The following is the parsable format, which can be fed to
 
 
 class TestOSCapability(base.BaseTestCase):
-    def setUp(self):
-        super(TestOSCapability, self).setUp()
-
     @mock.patch('oslo_concurrency.processutils.execute')
     def test_get_cpu_numa_info_with_online(self, mock_output):
         mock_output.return_value = LSCPU_ON

zun/tests/unit/objects/test_numa.py

@@ -16,9 +16,6 @@ from zun.tests import base
 
 
 class TestNUMA(base.BaseTestCase):
-    def setUp(self):
-        super(TestNUMA, self).setUp()
-
     def test_free_cpus_numa(self):
         obj = objects.NUMATopology(cells=[
             objects.NUMANode(