STP PR - Fixed lgtm warnings

Author: ph408077

config/stp.py

@@ -5,7 +5,6 @@
 
 import click
 import utilities_common.cli as clicommon
-from swsscommon.swsscommon import SonicV2Connector
 from natsort import natsorted
 import logging
 

tests/stp_test.py

@@ -1,6 +1,4 @@
 import os
-import traceback
-from unittest import mock
 from click.testing import CliRunner
 
 import config.main as config