tools: Add switchover / hot standby capability to tools services
If tools-services-01 goes down, we can make tools-services-02
active by:
- Setting the active_host parameter for the role via hiera
- Forcing a puppet run
Both these steps can be done by any tools admin.
Bug: T95521
Change-Id: I58e07ceffe2ffaf5e5baf7b567f87a2c6ab43718