PEP8 fixes

test/teos/unit/test_api.py

@@ -7,7 +7,6 @@ from teos import HOST, PORT
 import teos.errors as errors
 from teos.watcher import Watcher
 from teos.inspector import Inspector
-from teos.gatekeeper import Gatekeeper
 from teos.appointments_dbm import AppointmentsDBM
 from teos.responder import Responder, TransactionTracker
 

test/teos/unit/test_db_manager.py

@@ -1,5 +1,4 @@
 import os
-import json
 import shutil
 import pytest
 

test/teos/unit/test_responder.py

@@ -1,4 +1,3 @@
-import json
 import pytest
 import random
 from uuid import uuid4