Another wip commit resolving problems installing the util stack. Also,
remove datadog from staging hosts where it's not needed.

* Making newly merged release branch get closer to working

Conflicts:
	playbooks/edx-west/carnegie-prod-app.yml
	playbooks/edx-west/prod-jumpbox.yml
	playbooks/edx-west/stage-all.yml
	playbooks/roles/common/tasks/create_users.yml (deleted)
	playbooks/roles/datadog/handlers/main.yml
	playbooks/roles/edxapp/defaults/main.yml
	playbooks/roles/edxapp/tasks/deploy.yml
	playbooks/roles/edxapp/tasks/main.yml
	playbooks/roles/nginx/tasks/main.yml
	playbooks/roles/nginx/templates/basic-auth.j2
	playbooks/roles/nginx/templates/edx_logrotate_nginx_access.j2
	playbooks/roles/nginx/templates/edx_logrotate_nginx_error.j2
	playbooks/roles/xqueue/tasks/main.yml

Go from copy to template so certs_home gets substituted in correctly

Substantially similar to the certs role developed (in paralell) that
exists on master, but this one uses pre-Croissant directory structure
and variable conventions. Modeled on the croissant-era notifier role.
Useful as a bridge to midterms, when Stanford can afford to port to the
new ways of doing things.

Includes updates to logging-related tasks for ansible and datadog. These
are ongoing problems for us at the moment.

add host for mysql

PHP / PHPMYADMIN role

Add logrotation to Stanford datadog setup

* Datadog logs now get rotated like other system logs
* nginx logs get rotated to have group syslog, so the datadog agent will
  continue to be able to read them

* Moving test() contents into doctests
* Adding comments to the methods explaining what they're used for

Stanford-oriented Datadog updates

* Datadog explicitly sets hostname in style Stanford uses (relies on
  /etc/hostname being accurate, requires reboot)
* Enables nginx status check module integration for datadog
* Installs nginx access log processor that counts HTTP response codes
* Updates to lots of other places to make sure that their logs appear
  where we expect
* Has sample code showing how to emit events from log contents which make it
  into the Datadog event stream
* Separation of stage and prod datadog configurations

vagrant-devstack-fix: Fix inverted names for nfs-mounted directories

devstack-gitignore: Don't track external repositories

some final changes before the dosa release

Use debian packages from S3 to fix the browser versions for Chrome and FF

Jarv/vagrant releases

Updates to Jenkins master

Moved the role to using the root s3fs as it supports IAM