Zabbix

.......PS. [ZBX-6798] improved error messages from UnixODBC library for Database Monitor items
.......PS. [ZBX-6797] added configurable ODBC login timeout

Before this change:
   - some UnixODBC error messages were of little help,
   - ODBC login timeout had a fixed value, 5 seconds.

After this change:
   - error messages from UnixODBC are more detailed. SQLState added, multi-record diagnostics
     supported, but the message length is limited to 128 bytes.
   - ODBC login timeout is set equal to "Timeout" parameter in server configuration file.