Additional code needed for Domain controllers 'V-73283'

[rx294]

The control does not address, specific check for domain controllers.

https://github.com/mitre/stig-microsoft-windows-server-2016-v1r4-baseline/blob/e6e7ff348bc5e5ed205ae51595aaf703d9459af2/controls/V-73283.rb#L39

[kkola]

8c6279c fixes this issue, but had to use a different set of commands to obtain the desired results