ONOS-3515 Added ability to configure different link-weight functions as defaults; or inject custom ones.

ONOS-3516 Added ability to inject alternate graph path search algorithms.

Change-Id: If5831c198a831ae79a9933fc794eb7deab776e2f
diff --git a/providers/null/src/main/java/org/onosproject/provider/nil/NullProviders.java b/providers/null/src/main/java/org/onosproject/provider/nil/NullProviders.java
index c568841..68c536b 100644
--- a/providers/null/src/main/java/org/onosproject/provider/nil/NullProviders.java
+++ b/providers/null/src/main/java/org/onosproject/provider/nil/NullProviders.java
@@ -168,7 +168,7 @@
 
 
     @Activate
-    public void activate(ComponentContext context) {
+    public void activate() {
         cfgService.registerProperties(getClass());
 
         deviceProviderService = deviceProviderRegistry.register(deviceProvider);
@@ -180,7 +180,7 @@
     }
 
     @Deactivate
-    public void deactivate(ComponentContext context) {
+    public void deactivate() {
         cfgService.unregisterProperties(getClass(), false);
         tearDown();