daemon-util incorrect usage of start-stop-daemon

[chas-mafli]

On debian buster at least with ganeti 2.16 daemon-util uses the --startas flag to start-stop-daemon which causes errors like Can't start Ganeti master: start-stop-daemon: matching only on non-root pidfile /var/run/ganeti/ganeti-luxid.pid is insecure.

I managed to fix this by switching --startas to --exec in daemon-util

Here's the same bug in exim https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=921557