Add zabbix user to pre-defined system groups on first setup

[nafetsreuab]

Often zabbix-agent needs to read log-files and stuff that it has no permissions to.

Please add option (like in the apache module) for zabbix-agent so it will be added to additional groups on first install:

supplementary_groups

Data type: Any

A list of groups to which the user(zabbix) belongs. These groups are in addition to the primary group. Notice: This option only has an effect when manage_user is set to true.

Default value: []

Thank you!

[floriankoenig-work]

I'd also love to see this feature

[kenyon]

Pull requests accepted 😃