Investigate how to setup and test DS as a repo in an active-passive setup

Description

The described approach for having HA when using DS as a repo is to setup the ds repo in an active-passive setup. The active-passive setup will have one DS master node and a hot spare that can be swapped to if the master were to die. This setup needs to be documented and tested.

Acceptance Criteria

• Set up IDM and DS in an active-passive configuration
• Document how to setup IDM and DS in an active-passive configuration and file a doc jira for this
• Come up with some test scenarios to test IDM resiliency when the master node dies and the backup node is used. This will require working with the QA team to create some reproducible tests for these scenarios