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On systemd systems we generally don't need to chdir() to root, we don't need to setup /dev/ ourselves (as PID 1 does that during earliest boot), and we don't need to set the OOM adjustment values, as that's done via unit files. Hence, drop this. if people want to use udev from other init systems they should do this on their own, I am very sure it's a good thing to do it from outside of udevd, so that fewer privileges are required by udevd. In particular the dev_setup() stuff is something that people who build their own non-systemd distros want to set up themselves anyway, in particular as they already have to mount devtmpfs themselves anyway. Note that this only drops stuff that isn't really necessary for testing stuff, i.e. process properties and settings that don't matter if you quickly want to invoke udev from a terminal session to test something.
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