fixed to check if network interface is up or not

rosjava/src/main/java/org/ros/address/InetAddressFactory.java

@@ -52,8 +52,14 @@ public class InetAddressFactory {
     }
     List<InetAddress> inetAddresses = Lists.newArrayList();
     for (NetworkInterface networkInterface : networkInterfaces) {
+      try{
+        if (networkInterface.isUp()) {
           inetAddresses.addAll(Collections.list(networkInterface.getInetAddresses()));
         }
+      } catch (SocketException e) {
+        throw new RosRuntimeException(e);
+      }
+    }
     return inetAddresses;
   }