Fix: use the default broadcast address as DHCP ACK option

Change-Id: I9990f3e90bfc50d291283869259622a357a0874b
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingDhcpHandler.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingDhcpHandler.java
index d01a75c..cab32d2 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingDhcpHandler.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingDhcpHandler.java
@@ -389,7 +389,8 @@
             options.add(doSubnetMask(subnetPrefixLen));
 
             // broadcast address
-            options.add(doBroadcastAddr(yourIp, subnetPrefixLen));
+            // do not specify broadcast address, let host use default value
+            // options.add(doBroadcastAddr(yourIp, subnetPrefixLen));
 
             // domain server
             options.add(doDomainServer(osSubnet));