Manage the state of systemd units without touching systemctl.
Usage
# start unitmgr (in the real world this should be systemd service instead)
unitmgr -src /units &
# copy over a unit file to start running it
# any changes to the file will cause the unit to be restarted
cp myprocess.service /units
# delete the unit to stop running it
rm /units/myprocess.service
# that's all!