Fix for JIRA ONOS-4620. Whenever networkconfiguration is deleted even the queued will be removed

Change-Id: I8d7f1a873af90cf86ea34f1a2b1585ef4c3e46e4
diff --git a/core/api/src/test/java/org/onosproject/net/config/NetworkConfigServiceAdapter.java b/core/api/src/test/java/org/onosproject/net/config/NetworkConfigServiceAdapter.java
index 1dc9211..1bad3a9 100644
--- a/core/api/src/test/java/org/onosproject/net/config/NetworkConfigServiceAdapter.java
+++ b/core/api/src/test/java/org/onosproject/net/config/NetworkConfigServiceAdapter.java
@@ -95,4 +95,12 @@
     @Override
     public void removeListener(NetworkConfigListener listener) {
     }
+
+    @Override
+    public <S> void removeConfig(S subject) {
+    }
+
+    @Override
+    public <S> void removeConfig() {
+    }
 }