code: public Map<String, Map<String, List<String>>> revokeAllResourcePermissions(String subjectid) {
  		if (StringUtils.isBlank(subjectid)) {
  			return Collections.emptyMap();
  		}
  		return getEntity(invokeDelete(Utils.formatMessage("_permissions/{0}", subjectid), null), Map.class);
  	}
docs: Revokes all permission for a subject.
  @param subjectid subject id (user id)
  @return a map of the permissions for this subject id