Invalidate the dns cache after 1 second

[refs #e517436e5e68]

Author: jfahrer

load_balancer/proxy.conf

@@ -1,7 +1,7 @@
 server {
   listen 80 default_server;
 
-  resolver 127.0.0.11;
+  resolver 127.0.0.11 valid=1s;
 
   set $protocol $PROXY_PROTOCOL;
   set $upstream $PROXY_UPSTREAM;