Merge pull request #13699 from edx/andya/move-contentserver

cms/djangoapps/contentstore/tests/test_core_caching.py

cms/djangoapps/contentstore/views/assets.py

cms/djangoapps/contentstore/views/tests/test_transcripts.py

cms/envs/common.py

lms/djangoapps/courseware/tests/test_video_handlers.py

lms/envs/common.py

openedx/core/djangoapps/contentserver/__init__.py

openedx/core/djangoapps/contentserver/admin.py

openedx/core/djangoapps/contentserver/caching.py

openedx/core/djangoapps/contentserver/middleware.py

.../core/djangoapps/contentserver/migrations/0001_initial.py

...apps/contentserver/migrations/0002_cdnuseragentsconfig.py

openedx/core/djangoapps/contentserver/migrations/__init__.py

openedx/core/djangoapps/contentserver/models.py

openedx/core/djangoapps/contentserver/test/__init__.py

.../core/djangoapps/contentserver/test/test_contentserver.py