log uncaught Exception

- Use execute instead of submit so that uncaught Exception will
  be dealt and logged by ExecutorService's handler.
- Use component's own logger

Change-Id: I761264aea00748980929b5048e111756776dd2f6
diff --git a/core/net/src/main/java/org/onosproject/net/packet/impl/PacketManager.java b/core/net/src/main/java/org/onosproject/net/packet/impl/PacketManager.java
index b068270..8a74819 100644
--- a/core/net/src/main/java/org/onosproject/net/packet/impl/PacketManager.java
+++ b/core/net/src/main/java/org/onosproject/net/packet/impl/PacketManager.java
@@ -120,7 +120,7 @@
     @Activate
     public void activate() {
         eventHandlingExecutor = Executors.newSingleThreadExecutor(
-                groupedThreads("onos/net/packet", "event-handler"));
+                groupedThreads("onos/net/packet", "event-handler", log));
         localNodeId = clusterService.getLocalNode().id();
         appId = coreService.getAppId(CoreService.CORE_APP_NAME);
         store.setDelegate(delegate);