Assigning names to various threads

- specify nearby logger when possible

Change-Id: Ia8925ab1459c4d1da922becd0e201388d44d4294
diff --git a/core/store/dist/src/main/java/org/onosproject/store/packet/impl/DistributedPacketStore.java b/core/store/dist/src/main/java/org/onosproject/store/packet/impl/DistributedPacketStore.java
index 27b0973..25429ad 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/packet/impl/DistributedPacketStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/packet/impl/DistributedPacketStore.java
@@ -57,6 +57,7 @@
 
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Strings.isNullOrEmpty;
+import static java.util.concurrent.Executors.newFixedThreadPool;
 import static org.onlab.util.Tools.get;
 import static org.onlab.util.Tools.groupedThreads;
 import static org.slf4j.LoggerFactory.getLogger;
@@ -284,7 +285,8 @@
      */
     private void restartMessageHandlerThreadPool() {
         ExecutorService prevExecutor = messageHandlingExecutor;
-        messageHandlingExecutor = Executors.newFixedThreadPool(getMessageHandlerThreadPoolSize());
+        messageHandlingExecutor = newFixedThreadPool(getMessageHandlerThreadPoolSize(),
+                                                     groupedThreads("DistPktStore", "messageHandling-%d", log));
         prevExecutor.shutdown();
     }