jenkins_common github template fix

Make discovery repository details configurable.

Enable configuration of splunk host value

Jdmulloy/ops2117/mongo32 runbook

This is to prevent the situation described in the
following Mongo Jira ticket.

https://jira.mongodb.org/browse/SERVER-24887

rename jenkins github plugin variables

Fix jenkins common role  TE-2210

Fix spelling of vagrant-hostsupdater

add generic config for github plugin

* Add logging for jenkins app, with logrotate
* Fix the user:group of installed files
* Specify the uid:gid for the new jenkins user so it will match those on the attached data volume
* Configure jenkins.war expansion into /var/cache
* Add Splunkforwarder installation and configuration

Added django-parler configuration for django-parler

jenkins_common: Add credential id for ssh template

Deal with the case when CREATE_SERVICE_WORKER_USERS is false.

Just use the one in common that's always defined.

In this case, `service_worker_users` still needs to be defined because the when condition is applied for each item in the `{{ service_worker_users }}` list.  So that var always has to resolve.

Optional `aws` role and `EDXAPP_MYSQL_ATOMIC_REQUESTS`

Added the option of overriding atomic requests without having to override the entire database configuration structure.

Added a way to override having the aws role be installed. In cases where a local host is being used, aws role is not needed. Default remains true though.

Added the `install:configuration` tag to the step that writes the forum_env to disk so that updated mongodb credentials
are properly propagated to the service during deployments.

Add configuration for extra middleware classes

Remove jenkins_build play script override

Enable splunk and jvm args on jenkins

Fix mask_passwords template name

download specific branches of jenkins configuration