Bugfix/948346

Eduard Blochrequested to merge
blade/xdm:bugfix/948346 into debian-unstable

This applies changes announced in #948346:

  • Improved logrotate script to employ systemd if possible
  • Moved SIGUSR2/SIGHUP handling to reduce risk of races with legacy SysV init
  • Removing pidfile remains if the other process is gone

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