Zabbix 3.0.15 release

Merge remote-tracking branch 'origin/master' into 3.4

Merge remote-tracking branch 'origin/master' into 3.2

Merge remote-tracking branch 'origin/master' into 3.0

Merge pull request zabbix#223 from zabbix/master

Fixed issue with web-nginx-mysql image

Zabbix 3.4.5 release

Zabbix 3.4.4 release

Zabbix 3.0.13 release

Merge pull request zabbix#166 from zabbix/master

Fixed MySQL user creation

Merge pull request zabbix#157 from zabbix/master

Fixed issue with sender and get in case of proxy and server images