GossipStores: iterate using forEach

Change-Id: I1c230932ab1c9112692708a4d5c869eac3c50db8
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java
index b623b5d..aae808a 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java
@@ -1032,12 +1032,9 @@
         Map<PortFragmentId, Timestamp> adPorts = new HashMap<>(numDevices * portsPerDevice);
         Map<DeviceId, Timestamp> adOffline = new HashMap<>(numDevices);
 
-        for (Entry<DeviceId, Map<ProviderId, DeviceDescriptions>>
-            provs : deviceDescs.entrySet()) {
+        deviceDescs.forEach((deviceId, devDescs) -> {
 
             // for each Device...
-            final DeviceId deviceId = provs.getKey();
-            final Map<ProviderId, DeviceDescriptions> devDescs = provs.getValue();
             synchronized (devDescs) {
 
                 // send device offline timestamp
@@ -1065,7 +1062,7 @@
                     }
                 }
             }
-        }
+        });
 
         return new DeviceAntiEntropyAdvertisement(self, adDevices, adPorts, adOffline);
     }