Zabbix

..F....... [ZBX-20288] fixed cloning services twice when hitting enter key in configuration form

Merge in ZBX/zabbix from feature/ZBX-20288-5.5 to master

* commit '4392c37540f47655a5d3b451e7b1e03a1dea48be':
  ..F....... [ZBX-20288] fixed cloning SLAs in configuration form #2
  ..F....... [ZBX-20288] fixed cloning SLAs in configuration form
  ..F....... [ZBX-20288] fixed cloning services twice hitting enter key in configuration form