SWAT-92

Add a prefix from the hostname.  If building images, this will be the hostname
of the machine that the image is based on.  If running in a rolling fashion,
this will give each machine its own cache.

https://django.readthedocs.org/en/1.4/ref/settings.html

This is releated to that so it is also reverted.

- Added explicit values for variables that must be shared between ecommerce and edxapp
- Added ecommerce virtualenv bin directory to PATH for ecommerce user
- Using local Django settings (instead of production)
- Disabled static file compilation for devstack
- Allowing ecommerce version to be specified via environment variable

ECOM-2185

ECOM-2185

An aggregate score is one derived from multiple problems (such as the
cumulative score for a vertical element containing many problems). Sending
aggregate scores immediately introduces two issues: one is a race condition
between the view method and the Celery task where the updated score may not
yet be visible to the database if the view has not yet returned (and committed
its transaction). The other is that the student is likely to receive a stream
of notifications as the score is updated with every problem. Waiting a
reasonable period of time allows the view transaction to end, and allows us to
collapse multiple score updates into a single message.

The time value is in seconds.

This is a feature flag, not a setting

This reverts commit adb81f4a.

3rd Party auth is now managed via django admin an not from json config.

https://github.com/edx/edx-platform/pull/8140/files#diff-8a23909bc8d201fba8525b1dd6396247

This returns backwards compatibility of configuration versions
before 09807f8e.

(cherry picked from commit 25cb491d6465b1f743a46c198443a8332ada1dff)

Since the cookie's domain is *.edx.org use different names to help with
testing in stage/prod/edge.