Allows haproxy to start without resolving

Fixes #519

haproxy/haproxy.cfg

@@ -1,6 +1,10 @@
 defaults
     mode http
     timeout connect 5000ms
+	default-server init-addr none
+
+resolvers docker_resolver
+	nameserver dns 127.0.0.11:53
 
 frontend http-in
     bind *:8080
@@ -9,10 +13,10 @@ frontend http-in
 
     use_backend l2 if host_direct
 
-    default_backend pwd 
+    default_backend pwd
 
 backend pwd
-    server node1 pwd:3000
+    server node1 pwd:3000 check inter 10s resolvers docker_resolver resolve-prefer ipv4
 
 backend l2
-    server node2 l2:443
+    server node2 l2:443 check inter 10s resolvers docker_resolver resolve-prefer ipv4