Match default cache size of 10000

https://github.com/coredns/coredns/blob/master/plugin/cache/cache.go#L236
This gets rounded down to the nearest multiple of 256: 9984

cluster/addons/dns/nodelocaldns/nodelocaldns.yaml

@@ -35,8 +35,8 @@ data:
     __PILLAR__DNS__DOMAIN__:53 {
         errors
         cache {
-                success 10000 30
+                success 9984 30
-                denial 10000 5
+                denial 9984 5
         }
         reload
         loop