Replace the "kill_as_root" argument with a much simpler "sudo" argument
and remove the now obsolete check for the output mode of "kill_as_root".
"kill_as_root" would only get set to True if both conditions are met:
a) command is running with sudo
b) command is running with an output mode ("log" or "stdout") where
pmb.helpers.run_core would kill it if it does not output anything
before a timeout is reached
The new "sudo" argument just indicates if the command is running with
sudo (a), regardless of the output mode (b).
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