bug fixes: clean data in p4runtime mirror while deactivating p4runtime driver

Change-Id: Ia60ea78623da9c4a3813780405433f621f195a1f
diff --git a/drivers/p4runtime/src/main/java/org/onosproject/drivers/p4runtime/mirror/AbstractDistributedP4RuntimeMirror.java b/drivers/p4runtime/src/main/java/org/onosproject/drivers/p4runtime/mirror/AbstractDistributedP4RuntimeMirror.java
index be0b0b3..dd3ea16 100644
--- a/drivers/p4runtime/src/main/java/org/onosproject/drivers/p4runtime/mirror/AbstractDistributedP4RuntimeMirror.java
+++ b/drivers/p4runtime/src/main/java/org/onosproject/drivers/p4runtime/mirror/AbstractDistributedP4RuntimeMirror.java
@@ -75,6 +75,7 @@
 
     @Deactivate
     public void deactivate() {
+        mirrorMap.destroy();
         mirrorMap = null;
         log.info("Stopped");
     }