chown'ing pid and socket files

[Michael Tokarev]

I've added two patches to the debian package of unbound.

https://salsa.debian.org/dns-team/unbound/-/blob/master/debian/patches/do-not-chown-control-socket.patch

This one only does chgrp of the control socket (instead of full chown).

https://salsa.debian.org/dns-team/unbound/-/blob/master/debian/patches/do-not-look-at-pidfile.patch

This one removes a lot of code to check for the pid in the pid file
and to chown the pidfile. Looks like a nice cleanup, and makes
unbound behave in a way similar to other daemons.

What do you think?

/mjt