Stop bulk arbitrary signature broadcasts, as they were creating a lot of network traffic, and are in the process of being replaced with a better method.

src/main/java/org/qortal/network/Network.java

@@ -1178,7 +1178,7 @@ public class Network {
     public void onExternalIpUpdate(String ipAddress) {
         LOGGER.info("External IP address updated to {}", ipAddress);
 
-        ArbitraryDataManager.getInstance().broadcastHostedSignatureList();
+        //ArbitraryDataManager.getInstance().broadcastHostedSignatureList();
     }