Update DNS server list in China

gen_xinzhou.sh

@@ -7,6 +7,10 @@ mac='
 b8:59:9f:07:7d:f3
 b8:59:9f:07:7f:c3
 b8:59:9f:07:7f:bb
+b8:59:9f:07:81:cb
+b8:59:9f:07:7e:03
+b8:59:9f:07:80:6b
+b8:59:9f:07:89:b3
 '
 i=2
 hostname_prefix=xinzhou-tiogapass-
@@ -63,7 +67,7 @@ allow-hotplug ens9f1
 iface ens9f1 inet static
   address 10.0.45.$(( 50 + $i ))/24
   gateway 10.0.45.1
-  dns-nameservers 1.2.4.8
+  dns-nameservers 1.2.4.8 223.5.5.5 223.6.6.6
 
 #allow-hotplug ens9f0
 ##iface ens9f0 inet dhcp