Refactor: Removed unused imports

Removed unused imports from lms/djangoapps/{course_wiki, coursewarehistoryextended, discussion}

lms/djangoapps/discussion/django_comment_client/tests/test_utils.py

@@ -3,7 +3,6 @@
 
 import datetime
 import json
-import sys
 from unittest import mock
 from unittest.mock import Mock, patch
 

lms/djangoapps/discussion/rest_api/forms.py

@@ -1,11 +1,7 @@
 """
 Discussion API forms
 """
-
-
-import six.moves.urllib.error
 import six.moves.urllib.parse
-import six.moves.urllib.request
 from django.core.exceptions import ValidationError
 from django.forms import BooleanField, CharField, ChoiceField, Form, IntegerField
 from opaque_keys import InvalidKeyError

lms/djangoapps/discussion/rest_api/views.py

@@ -4,8 +4,6 @@ Discussion API views
 
 
 import logging
-
-from django.conf import settings  # lint-amnesty, pylint: disable=unused-import
 from django.contrib.auth.models import User  # lint-amnesty, pylint: disable=imported-auth-user
 from django.core.exceptions import ValidationError
 from edx_rest_framework_extensions.auth.jwt.authentication import JwtAuthentication