Zabbix

...G...... [ZBX-20538] changed postgres plugin to handle connection per user and not per database for Zabbix agent 2

* commit '709cd2a4421cd93041ad36413d0c240efdd8fea9':
  ...G...... [ZBX-20538] code clean up
  .......... [ZBX-20538] added change log
  ...G...... [ZBX-20538] code clean up
  ...G...... [ZBX-20538] changed postgres plugin to handle connection per user and not per database for Zabbix agent 2

(cherry picked from commit db088f820e140e1c8a4c3f1338ec5b4a3117f15e)