WHAT

As a developer or administrator, I want to authenticate to RH SSO, so I can use RH OpenShift Service Registry. 

However, the upstream Apicurio docs include several references (6) to the existing MAS SSO token endpoint:

"https://identity.api.openshift.com/auth/realms/rhoas/protocol/openid-connect/token"

See https://github.com/Apicurio/apicurio-registry/search?q=identity.api.openshift.com

These are pulled downstream and published in several RHOSR Guides:

• Managing Service Registry data using the core REST API
• Managing schemas and APIs using the Service Registry Maven plug-in
• Managing schemas and APIs using the Service Registry Java client

These references must be updated when migration to Red Hat SSO is complete (see MGDSRVS-188).
When migration is complete, the new Red Hat SSO token endpoint will be as follows:

"https://sso.redhat.com/auth/realms/redhat-external/protocol/openid-connect/token"

WHY

Per MGDSRVS-188, MAS SSO will be migrated to Red Hat SSO. Existing references to MAS SSO URLs will be invalid.