Comment 5 for bug 498359

Fortunately, the unbound-control-setup script is not interactive and produce all the 4 files needed. I've only add this to unbound.postinst :

/usr/sbin/unbound-control-setup >/dev/null 2>&1 && chown root:unbound /etc/unbound/unbound_{control,server}.{key,pem}

I've merge the 2 patches for convenience.