divya dadlani <> in Errai

Fixed ERRAI-839: Class-level validation now works independently.

Add class types that are annotated with validation annotations to the set of

validatable beans in the GwtValidatorGenerator.

Test for proper validation of types annotated with class-level annotations

that do not contain any field-level validation annotations.

Fixed ERRAI-862: Logging out via the KeycloakAuthenticationService now also ends the user's active Keycloak session.