[Pgpool-committers] pgpool - pgpool-II: Fix do_md5().

[User T-ishii]

Log Message:
-----------
Fix do_md5(). If raw mode or number of backend is 1, pgpool child segfaults.
patch contributed by Rob Shepherd, slight editing by Tatsuo Ishii.

Fix read_password_packet(). Guard against invalid password lenghth.

Fix send_password_packet(). password string in a password packet must be
a "string" message type, which must has a null termination. Otherwise
you will see "invalid passoword packet size" error message in backend.

Modified Files:
--------------
    pgpool-II:
        pool_auth.c (r1.27 -> r1.28)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgpool/pgpool-II/pool_auth.c?r1=1.27&r2=1.28)