Fixes a regression introduced by 23223.

Additionally adds a cleanUp method for the pipeliners
to reset the internal states between different executions.
This was another regression introduced by 23223.

Fixes also a memory leak caused by re-init of the grouphandler
without terminating its internal references

Change-Id: I06e9e005110c5237cb3bdf893cc71975fb94281e
diff --git a/drivers/default/src/main/java/org/onosproject/driver/pipeline/ofdpa/OvsOfdpa2Pipeline.java b/drivers/default/src/main/java/org/onosproject/driver/pipeline/ofdpa/OvsOfdpa2Pipeline.java
index 97c6143..09a52fb 100644
--- a/drivers/default/src/main/java/org/onosproject/driver/pipeline/ofdpa/OvsOfdpa2Pipeline.java
+++ b/drivers/default/src/main/java/org/onosproject/driver/pipeline/ofdpa/OvsOfdpa2Pipeline.java
@@ -32,6 +32,13 @@
 
     @Override
     protected void initGroupHander(PipelinerContext context) {
+        // Terminate internal references
+        // We are terminating the references here
+        // because when the device is offline the apps
+        // are still sending flowobjectives
+        if (groupHandler != null) {
+            groupHandler.terminate();
+        }
         groupHandler = new OvsOfdpa2GroupHandler();
         groupHandler.init(deviceId, context);
     }