Deploy multiple RHOSO.

Define a Central Site. Reconfigure other RHOSO to use the Central Site keystone.

Test that authentication is working in all sites.

Success criteria:

• Single keystone, multiple RHOSO
• Fully documented procedure to reconfigure RHOSO to use a central keystone instance, local keystone users.
• Login is all sites works with local users is successful.
• Connect a keycloak to the central keystone.
• Repeat login testing on all sites, and is successful

Stretch goal:

• Check Horizon login and see if we can see multiple sites, or if we need the Horizon Team to step in.