Updated sqoop mirror

(WIP) Michael/container balancer

Michael/dependencies

use YAML syntax for ansible tasks

rewrite ansible tasks using YAML syntax

DEVOPS-4424 make Discovery JWT overridable

Go back to the default method of stopping workers

using YAML syntax to rewrite the ansible tasks

Arbab/user role fix

WL-506: Update configuration ansible script for edxapp to support lms theming

Only write out when there is a key

We had a persistent problem of workers getting stuck when trying to stop
during 12.04 native installation.  This fixes the problem, while still
allowing active tasks to complete.

This reverts pull request #2133, and removes the stopasgroup setting
that was causing the trouble.

Create an ansible script for running populate_model.

New version released

Add jenkins to splunk

Initially used for xblock configurations, but can be used for any
ConfigurationModel.

rewrite ansible tasks using YAML style