Add sysops group

The wheel group is allowed to do everything by default.
We need a separate group to really confine users.

For example:

$ sudo ls

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

[sudo] password for pashev:
Sorry, user pashev is not allowed to execute '/run/current-system/sw/bin/ls --color=tty' as root on vbox-manul.

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