To support minimal environments, notably minimal Docker containers
which don't have /usr/bin/sudo by the time pkg-manager.sh is invoked
(possibly to install sudo), support running all commands without
invoking sudo first. Of course this only works if invoked as root.
Note that this is still somewhat hacky, command-line parsing needs to
be cleaned up.
Signed-off-by: Jan Lindemann <jan@janware.com>