* INCR-234: Run python-modernize and isort on openedx/core/djangoapps/oauth_dispatch

* INCR-234: [ADD] Missing module docstring

* INCR-239: Run python-modernize and isort on openedx/core/djangoapps/programs [tests, tasks]

* INCR-239: Grouped six package and represent unused variables with _

* INCR-211:  run python-modernize and isort to support python2 --> python3 transition

* INCR-211: fix pylint errors.

Removed unused module import request and error.
Used import as to avoid too deep a function call.

Altering imports and using suppression of pylint's import error.

* INCR-211: ignore pylint's import error from six module.

* INCR-211: remove unused modules.  Ignore pylint import error from six module.

* INCR-211:  ignore pylint's import error from six module.  Group imports.

* INCR-211:  disable error of 'must be called with literal string'

The specific context for this error means we can disable this.

* INCR-211: change import to satisfy pylint by renaming import

* INCR-211: fix imports so six.unichr works.

Add applicability endpoint

* INCR-240: Run python-modernize and isort on openedx/core/djangoapps/util

* INCR-240: [ADD] Missing module docstring at ratelimit

remove flaky test

* INCR-149: Run python-modernize on openedx/core/djangoapps [self_paced, coursegraph]

* INCR-149: Groups to absolute_import and unicode_literals

complete waiting enrollments

INCR-235: Run python-modernize and isort on openedx/core/djangoapps/user_authn [tests, user_authn] (#20514)

INCR-158

INCR-141

INCR-133: Run python-modernize on common/djangoapps/xblock_django [migrations, management, tests] (#20520)

INCR-139

INCR-164: Run python-modernize on common/djangoapps/microsite_configuration [backends, management, migrations] (#20507)

INCR-141: Run python-modernize on openedx/core/djangoapps/content/block_structure [migrations, management, config]

* INCR-145: Run python-modernize on openedx/core/djangoapps/contentserver

* INCR-145: [FIXED] line over length limit

* INCR-145: [ADD] Missing whitespace

* INCR-160: Run python-modernize on openedx/core/djangoapps/verified_track_content

* INCR-160: [FIX] line over length limit, datetime - pytz import

Upgrade edx-enterprise to 1.5.0.

* INCR-166 Run python-modernize on openedx/core/djangolib

* INCR-166 disabled harmless errors and added docstring

* INCR-159 Run python-modernize on openedx/core/djangoapps/zendesk_proxy

* INCR-159 added docstring and disabled spurious import error

*  incr-178: ran modernize on openedx/features/content_type_gating

* removed unused imports

* ran isort on openedx/features/content_type_gating/migrations

* INCR-146: Run python-modernize on openedx/core/djangoapps/cors_csrf

* INCR-146: Disable pylint warning for import-error

Re-adding django-simple-history for CourseEnrollment

* INCR-154: Run python-modernize on openedx/core/djangoapps/dark_lang

* INCR-154: Grouping for absolute_import and unicode_literals at migrations