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
diff --git a/tcp_tests/tests/system/test_install_cookied_ocata.py b/tcp_tests/tests/system/test_install_cookied_ocata.py
index c3ac83f..125168d 100644
--- a/tcp_tests/tests/system/test_install_cookied_ocata.py
+++ b/tcp_tests/tests/system/test_install_cookied_ocata.py
@@ -11,7 +11,7 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-import os
+
 import pytest
 
 from tcp_tests import logger
diff --git a/tcp_tests/tests/system/test_install_mcp11_ovs_newton.py b/tcp_tests/tests/system/test_install_mcp11_ovs_newton.py
index 51a2826..b777931 100644
--- a/tcp_tests/tests/system/test_install_mcp11_ovs_newton.py
+++ b/tcp_tests/tests/system/test_install_mcp11_ovs_newton.py
@@ -11,13 +11,10 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-import copy
-import time
 
 import pytest
 
 from tcp_tests import settings
-from tcp_tests.helpers import ext
 from tcp_tests import logger
 
 LOG = logger.logger
diff --git a/tcp_tests/tests/system/test_install_mcp11_ovs_ocata.py b/tcp_tests/tests/system/test_install_mcp11_ovs_ocata.py
index 3dbd5e5..d99ffb5 100644
--- a/tcp_tests/tests/system/test_install_mcp11_ovs_ocata.py
+++ b/tcp_tests/tests/system/test_install_mcp11_ovs_ocata.py
@@ -11,7 +11,7 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-import os
+
 import pytest
 
 from tcp_tests import logger
diff --git a/tcp_tests/tests/system/test_install_virtlet.py b/tcp_tests/tests/system/test_install_virtlet.py
index 0341f11..817919c 100644
--- a/tcp_tests/tests/system/test_install_virtlet.py
+++ b/tcp_tests/tests/system/test_install_virtlet.py
@@ -11,13 +11,9 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-import copy
-import time
 
 import pytest
 
-from tcp_tests import settings
-from tcp_tests.helpers import ext
 from tcp_tests import logger
 
 LOG = logger.logger
diff --git a/tcp_tests/tests/system/test_mcp10_ovs_vxlan_install.py b/tcp_tests/tests/system/test_mcp10_ovs_vxlan_install.py
index 2c49259..570af89 100644
--- a/tcp_tests/tests/system/test_mcp10_ovs_vxlan_install.py
+++ b/tcp_tests/tests/system/test_mcp10_ovs_vxlan_install.py
@@ -11,13 +11,9 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-import copy
-import time
 
 import pytest
 
-from tcp_tests import settings
-from tcp_tests.helpers import ext
 from tcp_tests import logger
 
 LOG = logger.logger
diff --git a/tcp_tests/tests/system/test_opencontrail.py b/tcp_tests/tests/system/test_opencontrail.py
index 3781f7d..e21d978 100644
--- a/tcp_tests/tests/system/test_opencontrail.py
+++ b/tcp_tests/tests/system/test_opencontrail.py
@@ -11,13 +11,9 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-import copy
-import time
 
 import pytest
 
-from tcp_tests import settings
-from tcp_tests.helpers import ext
 from tcp_tests import logger
 
 LOG = logger.logger
diff --git a/tcp_tests/tests/system/test_tcp_install.py b/tcp_tests/tests/system/test_tcp_install.py
index 80bfc71..4e8b774 100644
--- a/tcp_tests/tests/system/test_tcp_install.py
+++ b/tcp_tests/tests/system/test_tcp_install.py
@@ -11,13 +11,9 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-import copy
-import time
 
 import pytest
 
-from tcp_tests import settings
-from tcp_tests.helpers import ext
 from tcp_tests import logger
 
 LOG = logger.logger
diff --git a/tcp_tests/tests/system/test_virtlet_actions.py b/tcp_tests/tests/system/test_virtlet_actions.py
index cf48ca8..5c8c9ea 100644
--- a/tcp_tests/tests/system/test_virtlet_actions.py
+++ b/tcp_tests/tests/system/test_virtlet_actions.py
@@ -11,13 +11,7 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-import copy
-import time
 
-import pytest
-
-from tcp_tests import settings
-from tcp_tests.helpers import ext
 from tcp_tests import logger
 
 LOG = logger.logger