ONOS-841 Renaming ONOS threads to simplify profiling.

Change-Id: I83a96bd875a0af9f3b78c06a9f9107c093b8e64e
diff --git a/core/net/src/main/java/org/onosproject/net/device/impl/DeviceManager.java b/core/net/src/main/java/org/onosproject/net/device/impl/DeviceManager.java
index 28dd3dc..292d761 100644
--- a/core/net/src/main/java/org/onosproject/net/device/impl/DeviceManager.java
+++ b/core/net/src/main/java/org/onosproject/net/device/impl/DeviceManager.java
@@ -111,7 +111,7 @@
 
     @Activate
     public void activate() {
-        backgroundService = Executors.newSingleThreadScheduledExecutor(namedThreads("device-manager-background"));
+        backgroundService = Executors.newSingleThreadScheduledExecutor(namedThreads("onos-device-manager-background"));
 
         store.setDelegate(delegate);
         eventDispatcher.addSink(DeviceEvent.class, listenerRegistry);