code: public Set<User> findAllMembers(Iterable<Name> absoluteIds) {
          return Sets.newLinkedHashSet(userRepo.findAll(toRelativeIds(absoluteIds)));
      }
docs: This method expects absolute DNs of group members. In order to find the actual users
  the DNs need to have the base LDAP path removed.
  
  @param absoluteIds
  @return