Merge pull request #11805 from edx/renzo/self-paced-modulestore-wrapper

cms/envs/aws.py

cms/envs/common.py

common/lib/xmodule/xmodule/modulestore/__init__.py

common/lib/xmodule/xmodule/modulestore/django.py

common/lib/xmodule/xmodule/modulestore/inheritance.py

common/lib/xmodule/xmodule/modulestore/mongo/base.py

...dule/modulestore/split_mongo/caching_descriptor_system.py

lms/djangoapps/courseware/field_overrides.py

lms/djangoapps/courseware/self_paced_overrides.py

lms/djangoapps/courseware/tests/test_field_overrides.py

lms/djangoapps/courseware/tests/test_self_paced_overrides.py

lms/envs/aws.py

lms/envs/common.py