Make ecommerce gunicorn worker class configurable.

upgrade Jenkins to Firefox 59, geckodriver 0.20

Revert "Update build jenkins plugins"

Update splunk forwarder role so it can be installed on Amazon Linux OS

Also, updated common server_utils so it do not need to be run on RHEL distributions

Update plugin to handle 64-bit ids DEVOPS-7185

Update build jenkins plugins

Bump installed jenkins_master version

It looks like this version disappeared from the downloads page within
the past few weeks. I successfully ran this play less than a month ago,
but it started failing a week or two ago, due to the 404 upon download.

I'm admittedly a bit confused as to why there appears to be at least 3
different minor versions of jenkins in use [1][2][3] (plus a major bump
on the build server?! [4]), so I simply cribbed the version used by the
`tools_jenkins` role.

References:
- [1] jenkins_version: "1.638"
- [2] jenkins_tools_version: "1.651.3"
- [3] jenkins_admin_version: "1.658"
- [4] build_jenkins_version: jenkins_2.60.3

add DEFAULT_COURSE_VISIBILITY_IN_CATALOG

ENH: extra vars to update.sh

Make it so we update alarms even when they already exist.

We don't need to pin back setuptools anymore

Add a new playbook to just install splunk forwarder

We can just use whatever version comes in with the venv setup safely

Install OpenStack Python requirements if using OpenStack settings

These were copied from old lms and seem unneeded

Allow the xqueue session engine to be configurable.

XQueue really doesn't make things like graphviz graphs, or use apparmor
(that's done in xserver or xqwatcher I believe)

We removed use of these templates after platform removed yaml

While we'll eventually switch back, having unused templates around is
confusing.

Other code removed in 8f16fd28

This defaults to http://localhost:18040 but needs internal hostname

Update sqoop 1.4.6 package download url

XQueue wasn't using this argument and it was removed

* Updating analytics jenkins role to work again, and to be more consistent with current codebase patterns

* Updating analytics jenkins role to work again, and to be more consistent with current codebase patterns. Moved jenkins.j2 to the directory with other j2 templates