debian/unbound.init: ask start-stop-daemon to remove the PID file when stopping the daemon

Simon Dezielrequested to merge
sdeziel-guest/unbound:sysvinit-pid-947771 into debian/latest

Patch taken from Gedalya gedalya@gedalya.net in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=947771#15 Closes #947771

Signed-off-by: Simon Deziel simon@sdeziel.info

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