Fix F* pep8 warnings

List of fixed warnings: F401, F403, F821

Change-Id: Iceb74ea81b3f4bb358dc331ba289dd1588c152fc
Reviewed-on: https://review.gerrithub.io/379376
Reviewed-by: Dennis Dmitriev <dis.xcom@gmail.com>
Tested-by: Dennis Dmitriev <dis.xcom@gmail.com>
diff --git a/tcp_tests/tests/system/conftest.py b/tcp_tests/tests/system/conftest.py
index d943a22..9089870 100644
--- a/tcp_tests/tests/system/conftest.py
+++ b/tcp_tests/tests/system/conftest.py
@@ -12,20 +12,20 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tcp_tests.fixtures.common_fixtures import *
-from tcp_tests.fixtures.config_fixtures import *
-from tcp_tests.fixtures.underlay_fixtures import *
-from tcp_tests.fixtures.rally_fixtures import *
-from tcp_tests.fixtures.salt_fixtures import *
-from tcp_tests.fixtures.common_services_fixtures import *
-from tcp_tests.fixtures.openstack_fixtures import *
-from tcp_tests.fixtures.opencontrail_fixtures import *
-from tcp_tests.fixtures.oss_fixtures import *
-from tcp_tests.fixtures.decapod_fixtures import *
-from tcp_tests.fixtures.stacklight_fixtures import *
-from tcp_tests.fixtures.virtlet_fixtures import *
-from tcp_tests.fixtures.virtlet_ceph_fixtures import *
-from tcp_tests.fixtures.k8s_fixtures import *
+from tcp_tests.fixtures.common_fixtures import *  # noqa
+from tcp_tests.fixtures.config_fixtures import *  # noqa
+from tcp_tests.fixtures.underlay_fixtures import *  # noqa
+from tcp_tests.fixtures.rally_fixtures import *  # noqa
+from tcp_tests.fixtures.salt_fixtures import *  # noqa
+from tcp_tests.fixtures.common_services_fixtures import *  # noqa
+from tcp_tests.fixtures.openstack_fixtures import *  # noqa
+from tcp_tests.fixtures.opencontrail_fixtures import *  # noqa
+from tcp_tests.fixtures.oss_fixtures import *  # noqa
+from tcp_tests.fixtures.decapod_fixtures import *  # noqa
+from tcp_tests.fixtures.stacklight_fixtures import *  # noqa
+from tcp_tests.fixtures.virtlet_fixtures import *  # noqa
+from tcp_tests.fixtures.virtlet_ceph_fixtures import *  # noqa
+from tcp_tests.fixtures.k8s_fixtures import *  # noqa
 
 
 __all__ = sorted([  # sort for documentation