Why
So the UI can use this to configure and launch the correct OAuth redirect flow

How
The current keycloak config endpoint is here https://github.com/aerogear/aerogear-unifiedpush-server/blob/master/jaxrs/src/main/java/org/jboss/aerogear/unifiedpush/rest/config/KeycloakConfigurationEndpoint.java
A similar endpoint will be needed that returns the oauth config (as configured in the server in https://issues.jboss.org/browse/AEROGEAR-2307