Fix SIGUSR2 handling. The signal handler only set flag. Then, pgpool call SIGUSR2 handler in CHECK_REQUEST macro.
Fix SIGUSR2 handling. The signal handler only set flag. Then, pgpool
call SIGUSR2 handler in CHECK_REQUEST macro.

treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres