[CBRD-25329] truncate milli-seconds when converting DATETIME to TIMESTAMP in server side JDBC

[hyunikn]

http://jira.cubrid.org/browse/CBRD-25329

[hyunikn]

I added a commit (c64142e) to suppress milli-seconds truncation of arguments to DATETIME type parameters and another commit (4a69274) that properly uses toDatetime() instead of incorrect toTimestamp() in some places.