EDUCATOR-1431 - HEAL process was overwriting transcript statuses as they were combined with transcode statuses. So, separated them out to avoid unnecassary masking of Video's transcript statuses.

token should not use - OR any other character as per regex in url.

File "/home/ec2-user/edx-video-pipeline/VEDA/django_secrets.py", line 24, in <module>
:     DJANGO_DEBUG = return_dict['debug']
: KeyError: 'debug'

- improve logging
- VEDA vedio status updation
- Remove celery task for retriving 3Play translations, accomodate it in heal process
- improve __unicode__ method and add help text
- Add an ability to override developer configs

This implements 3PlayMedia API integration in pipeline.
Other than that it also iuncludes:
-- rename 'Transcript Preferences' to 'Transcript Credentials'.
-- Add migrations.
-- Rename 'Transcription Ready' to 'Transcript Ready'.

See https://github.com/edx/credentials/pull/284/files and
https://github.com/carltongibson/django-filter/issues/562

Yro/update celery queues

Implement global timeout

Fix drf and django filter versions.

Issue: ImportError: Could not import 'rest_framework.filters.DjangoFilterBackend'

DRF-3.7.0 has removed DjangoFilterBackend, if we want to move to DRF-3.7.0, we shall be using 'django_filters.rest_framework.DjangoFilterBackend' instead.

Update Admin Settings

EDUCATOR-1426

Update heal commands

Add migrations folder

Eliminate NR decorators

Yro/sandbox update

Make course ids available to auto-generated images.

csv fnmatch fix