Log Message:
Update pgpool to 3.4.1.

Patch provided by Wen Heping in PR 43628.

Changes:
        * Fix handling failover when health_check was disabled. (Yoshiyuki)
          - The bug was introduced in 3.4.
        * Fix deadlock while processing Parse message. (Yoshiyuki)
        * Add new "replicate_select" directive, being the default value to
          be false. (Yoshiyuki)
          - If it is true, SELECT query is replicated. This behavior is
            same as V3.2 or earlier.
        * Improve signal handling. (Yoshiyuki)
          - Occasionaly, zombie processes were remained. Or processes were
            unstable.
        * Fix hang up when SELECT was error inside a transaction
          block. The bug was introduced in V3.3. (Yoshiyuki)
        * Fix PREPARE/EXECUTE handling in master slave mode. (Yoshiyuki)
        * Fix "kind mismatch error" when deadlock error
        * Fix hang up and SEGV in extended query protocol when a warning
          SQL like "SELECT '\'';" executed. (Yoshiyuki)
        * Fix memory leak when connection cache was full. (Yoshiyuki)
        * Improve replication. SELECT nextval() and SELECT setval() are
          now replicated. (Yoshiyuki)
        * Change SELECT query is only sent to the master node. (Yoshiyuki)
          - Use /*REPLICATION*/ comment to repliate a SELECT query.
        * Fix unexpected failover error due to receiving an interrupt
          signal while connecting to the backend. (Yoshiyuki)
        * Fix "ps" output to follow PostgreSQL's output. (Taiki)
        * Change the default value for enable_pool_hba to true. (Taiki)
        * Add "pgpool.pam" file, for PAM configuration file, to be
          installed under "$PREFIX/share/". (Taiki)
        * Support HBA authentication(Taiki)
        * Support log_connections(Taiki)
        * Support log_hostname(Tatsuo)
        * Show pgpool status in ps command(Tatsuo)
        * Fix bug with prepared query(Yoshiyuki)
        * Detach secondary server when "kind mismatch error" is \ 
detected(Tatsuo)
        * Re-open socket if it was closed by backend while reusing
          connection(Yoshiyuki)
        * Allow 0 weight(Tatsuo)
        * Return correct error messaes when pg_hba.conf auth fails. Patch
          contributed by Kenji Kikuchi
        * Fix kind mismatch errors with COPY FROM STDIN(Yoshiyuki)
        * Allow load balancing with extended protocol(Yoshiyuki)
        * Fix LISTEN/NOTIFY bug in master/slave mode reported by Michael
          Ulitskiy (Tatsuo)
        * Improve documentation. patches contributed by Mark Stosberg
        * Fix "kind is 0!" error in Execute(). Reads messages until
          receiving CommandComplete, EmptyQuery, ErrorResponse or
          PortalSuspend in Execute() (Yoshiyuki)
        * Add log_statement option. patches contributed by Thomas E
          Lackey, modifications and documents by Tatsuo
        * In SimpleForwardToFrontend() do not send SYNC and wait for ready for
          query when PANIC or FATAL error occurs. In this case the backend
          closes the communication channel immediately which will cause unwanted
          failover/degeneration by, for example, trying to connect to
          invalid database (Tatsuo)
        * Fix dealock problem in extended modd by calling synchronize() in
          Execute if replication_strict is enabled (Yoshiyuki)
        * Fix segfault problem in race conditions among
          connection_life_time, child_life_time and child_max_connections
        * pgpool does not exit even if pgpool.conf contents is wrong(Tatsuo)
        * Fix buffer overrun bug with long health_check_user name(Taiki)
        * Fix occasional segfault with replication and load balance
          enabled(bug id #1000548)(Tatsuo)
        * Fix pool_send_error_message to send properly NULL terminated
          string(Yoshiyuki)
        * Fix kind mismatch error in SimpleFowardFrontend(Yoshiyuki)
        * Enable to build with BSD make(Yoshiyuki)
        * Fix pool_debug and friends to block signals while
          executing(Tatsuo)
        * Fix numerous bugs with extended query(Yoshiyuki)
        * Fix INSERT LOCK(Yoshiyuki)
        * Do not reuse startup packet(Tatsuo)
        * Automatically DEALLOCTE prepared queries when client
          disconnects(Yoshiyuki)
        * Do not forward packets when length = 0 in
          SimpleForwardToFrontend/SimpleForwardToBackend(Tatsuo)
        * Fix lost of kind info(Tatsuo)
        * Fix bugs with master/slave mode introduced in 2.7.2. per report
          from David Boreham (Tatsuo)
        * Fix bugs with master/slave and prepared quries. per report
          from David Boreham (Tatsuo)
        * Changed Copyright to PgPool Global Development Group
        * Fix a typo in man page
        * PQnotifes() does not receive immediate responses from LISTEN
        * NOTIFY emits packet kind does not agree errors in master/slave
          mode
        * add pgpool man pages(Peter Eisentra)
        * Fix bug in show pool_status for ignore_leading_white_space