fix path to nsd.conf

setup/dns.sh

@@ -68,7 +68,7 @@ done
 # control-enable /etc/nsd/nsd.conf" returns "yes", so we explicitly
 # set it here.
 if [ -z "$PRIVATE_IPV6" -a "$TRAVIS" == "true" ]; then
-    cat >> /etc/nsd.conf <<EOF
+    cat >> /etc/nsd/nsd.conf <<EOF
   do-ip4: yes
   do-ip6: no
 remote-control: