Adding PUBLISHER_FROM_EMAIL for sending emails.

remove updates available check from MOTD

install pysqlite for devstack and jenkins workers

adding symlink pointing to 2.6

ECOM-6141

AN-7716 Update grading policy api url to new api

Add trailing slash to run_migrations so files go in to a directory

ECOM-2979

Added new setting variable "EXPIRING_SOON_WINDOW: 28"

ECOM-5847 ( Adding email functionality in DISCOVERY IDA )

Reorder AMI names so they sort better in the console

Jibsheet/disable automated upgrade 16.04

Backport fixes from e0d/xenial that enable the automated dockerfile

Update the configuration for the non-ses email backends.

ECOM-5847

Fix typo in yarn-site.xml template.

instruct nginx to add a X-Queue-Start header

This header gets added to requests proxied by nginx to various edx apps.
The New Relic agent, if there is one, reads this header to calculate the
time each request spends between the web server (nginx) and the
application server (django or some other cms).

The specific intention of this commit is to measure the time requests
spend queued at the gunicorn layer.

Make sure we become the application user

Avoid using the same register twice.

Script for assuming role by an automated process

Tags is an argument to ec2_tag not to the task

fix error on zero rate limited agents

On Docker images, it might not be present, so we don't need to modify it.

Also fix a bug with "sshd_config" being used as a register twice, so the second
usage overwrites the result of the first one.

Print error message in the case where we return empty