Allowed apps to specify whether the existing component config value should be overridden

Change-Id: Ic0992adb49cbcce17e17a71af954fbeeafde97d3
diff --git a/core/api/src/test/java/org/onosproject/cfg/ComponentConfigAdapter.java b/core/api/src/test/java/org/onosproject/cfg/ComponentConfigAdapter.java
index 97fa037..ebe868d 100644
--- a/core/api/src/test/java/org/onosproject/cfg/ComponentConfigAdapter.java
+++ b/core/api/src/test/java/org/onosproject/cfg/ComponentConfigAdapter.java
@@ -54,6 +54,10 @@
     }
 
     @Override
+    public void preSetProperty(String componentName, String name, String value, boolean override) {
+    }
+
+    @Override
     public void unsetProperty(String componentName, String name) {
 
     }