Add 'enterprise_worker' user to LMS user provisioning.

Ginkgo: Add optional task to rebuild the forum elasticsearch index

set FORUM_REBUILD_INDEX to run the rebuild_index rake task.

(cherry picked from commit d07e6fca)

(cherry picked from commit 3f496fb1)

(cherry picked from commit a6c0f2a5)

(cherry picked from commit 9cd47406)

(cherry picked from commit 43d85953)

(cherry picked from commit b47e7745)

Install course-discovery in devstack and fullstack

Configure s3 buckets for video images

fix sg param in packer jobs

parameterize sg for packer builds

Allow `confirm_email` & `terms_of_service` to show in extra fields.

PLAT-1614 Make Docker containers use en_US.UTF-8

Cache all static assets for 5 minutes by default?

* Initialize INSIGHTS_CLOUDFRONT to null

* Put cloudfront domain under INSIGHTS_CONFIG

* Use INSIGHTS_CLOUDFRONT_DOMAIN in insights config

* Define INSIGHTS_CLOUDFRONT_DOMAIN null by default

* Set CORS_ORIGIN_WHITELIST to INSIGHTS_DOMAIN

* Add CORS header to Insights static files

* Split CORS whitelist into default and extra

* Allow HEAD, GET, OPTIONS in Insights static

* Try setting CORS Origin to $http_origin

* Use if cond to enable/disable CORS instead of map

* Missing space

* Don't initialize $cors

* Back to the old $cors_origin map

* Don't send CORS whitelist to django settings

* Replace tab with spaces

* Remove allow_all var, and update changelog

* Rename CLOUDFRONT to CDN in var name

Add check-ses-limits python script

Enable for jenkins/mongo/rabbit

remove docker-proxy-user and add jenkins user to docker group instead

update documentation to specify how to run ansible

Upgrade to latest ansible.

Changes needed to install docker on tools-jenkins.