OData issues with multiple visible schema

The odata logic accommodates a subcontext specifying the schema to access. Other logic however doesn't allow for this:

• if multiple visible schema are exposed and have a cross reference, then the metadata links will be invalid as they are created based upon the Teiid Wildfly conventions.
• The keycloak logic exposes /$metadata as unsecured, but any of the schema/$metadata links would require authentication.