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: I60e368dc066af30ce2e53bf7e4cc7bba69387cd8

tests/test_kolla_docker.py

@@ -36,9 +36,6 @@ kd = imp.load_source('kolla_docker', kolla_docker_file)
 
 class ModuleArgsTest(base.BaseTestCase):
 
-    def setUp(self):
-        super(ModuleArgsTest, self).setUp()
-
     def test_module_args(self):
         argument_spec = dict(
             common_options=dict(required=False, type='dict', default=dict()),