remove unused optparse imports

common/djangoapps/student/management/commands/bulk_change_enrollment.py

@@ -5,7 +5,6 @@ from django.core.management.base import BaseCommand, CommandError
 from django.db import transaction
 from opaque_keys import InvalidKeyError
 from opaque_keys.edx.keys import CourseKey
-from optparse import make_option
 from six import text_type
 from openedx.core.djangoapps.content.course_overviews.models import CourseOverview
 

lms/djangoapps/courseware/management/commands/dump_course_ids.py

@@ -5,7 +5,6 @@ Output is UTF-8 encoded by default.
 """
 from __future__ import unicode_literals
 
-from optparse import make_option
 from textwrap import dedent
 
 from six import text_type

lms/djangoapps/courseware/management/commands/dump_course_structure.py

@@ -17,7 +17,6 @@ The resulting JSON object has one entry for each module in the course:
 """
 
 import json
-from optparse import make_option
 from textwrap import dedent
 
 from django.core.management.base import BaseCommand, CommandError