private void setCoordinatorPublicKey(FindCoordinatorResponse<ID> response) {
    if (response.getCoordinator() != null && response.getCoordinatorPublicKey() != null) {
      services.getMessenger().setPublicKey(response.getCoordinatorPublicKey(),
          response.getCoordinator());
    }
  }
for testing purpose

@param jrm the join response message to process
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/membership/GMSJoinLeave.java