ECOM-7905

Adding endpoints to get individual subjects and a full subject listing.  The subjects will be used on the marketing site to render the subject landing pages and eventually the all-subjects page.

LEARNER-2281

We want to avoid using the setup method when possible as it is broken
and makes three useless API calls.

LEARNER-2188

This reverts commit a0d539d678d0576e38f9284ba3ca58ee6c4e52f9.

LEARNER-2188

This reverts commit a6c66e55.

The previous attempt to resolve this issue did not work. Now we are
explicitly removing the code that made unnecessary Elasticsearch calls.

LEARNER-2188

- Upgraded packages
- Properly configured the library for devstack

LEARNER-2188

LEARNER-2229

Haystack attempts to always ensure the index mapping is up-to-date.
There is a bug in this code (at least when using Elasticsearch 1.x) that
results in an invalid mapping comparison. Given that our mapping is
static, this feature is simply a waste of resources since we always
make three API calls to Elasticsearch for every search call.

This commit disables this mapping check/update feature when executing a
search query.

LEARNER-2188

LEARNER-2154

These fields aren't required, but give additional data to affiliates using the API.

LEARNER-1700

This will ultimately be used by the marketing site to retrieve program data without having to store a separate reference (e.g. UUID).

LEARNER-2053

EDUCATOR-882

Populate course run effort values from Drupal API

ECOM-5776

ECOM-5776

Django Compressor is still used by Publisher, so these settings are still needed.

ECOM-5776

The metadata refresh command should log the short code of the partner for which an access token is being retrieved instead of always logging the value of the partner_code argument.

ECOM-5776

LEARNER-1119