A.173. Release 3.4.16

Set TCP_NODELAY and non blocking to frontend socket. (Tatsuo Ishii)

TCP_NODELAY is employed by PostgreSQL, so do we it.

Change systemd service file to use STOP_OPTS=" -m fast". (Bo Peng)

Change pgpool_setup to add restore_command in recovery.conf. (Bo Peng)

Fix segfault when %a is in log_line_prefix and debug message is on. (bug 376) (Tatsuo Ishii)

Fix queries hanging in parse_before_bind with extended protocol and replication + load-balancing. (bug 377) (Tatsuo Ishii)