Handle deprecation warn by importing right class.

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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