Handle deprecation warn by importing right class.

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lms/djangoapps/discussion/django_comment_client/utils.py

@@ -13,8 +13,7 @@ from django.db import connection
 from django.http import HttpResponse
 from django.urls import reverse
 from django.utils.deprecation import MiddlewareMixin
-from opaque_keys.edx.keys import CourseKey, UsageKey
-from opaque_keys.edx.locations import i4xEncoder
+from opaque_keys.edx.keys import CourseKey, i4xEncoder, UsageKey
 from pytz import UTC
 from six import text_type
 from six.moves import map

lms/djangoapps/instructor_task/tests/test_tasks.py

@@ -14,7 +14,7 @@ import ddt
 from celery.states import FAILURE, SUCCESS
 from django.utils.translation import ugettext_noop
 from mock import MagicMock, Mock, patch
-from opaque_keys.edx.locations import i4xEncoder
+from opaque_keys.edx.keys import i4xEncoder
 from six.moves import range
 
 from course_modes.models import CourseMode