pgpool in raw mode is mistaken on alive nodes
pgpool in raw mode is mistaken on alive nodes

VALID_BACKEND macro in raw mode should not be used. So, we add a specific
check when pgpool is running in raw mode.

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