Fix typo in error message
The patch adds ability to print pgpool-II process names in the log output and also the
new configuration parameter "log_line_prefix", which is the printf-style string
that is output at the beginning of each log line. Addition of log_line_prefix
obsoletes the "print_timestamp" and "print_user" configurations are are removed.
As per the PostgreSQL specification, calling close on non existing portals
is not an error. So on the same footings this commit ignores all such packets
and return the 'close complete' message to client with out going to backend