[ONOS-6401] Increase Netty request timeout to 500 milliseconds

Change-Id: I9da7e3a90281ab8eb4aa47d6eb7f14b3afc4c00b
diff --git a/core/store/dist/src/main/java/org/onosproject/store/cluster/messaging/impl/NettyMessagingManager.java b/core/store/dist/src/main/java/org/onosproject/store/cluster/messaging/impl/NettyMessagingManager.java
index d49964e..fae957a 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/cluster/messaging/impl/NettyMessagingManager.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/cluster/messaging/impl/NettyMessagingManager.java
@@ -94,7 +94,7 @@
 @Service
 public class NettyMessagingManager implements MessagingService {
 
-    private static final int REPLY_TIME_OUT_MILLIS = 250;
+    private static final int REPLY_TIME_OUT_MILLIS = 500;
     private static final short MIN_KS_LENGTH = 6;
 
     private final Logger log = LoggerFactory.getLogger(getClass());