Avoid unnecessary allocations needed to convert List to Set

Change-Id: I80b0bcf31f625f8e151155880075c888a0cf1c1d
diff --git a/core/store/dist/src/main/java/org/onosproject/store/resource/impl/EmptyDiscreteResources.java b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/EmptyDiscreteResources.java
index 6699787..87da883 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/resource/impl/EmptyDiscreteResources.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/EmptyDiscreteResources.java
@@ -19,7 +19,6 @@
 import org.onosproject.net.resource.DiscreteResource;
 import org.onosproject.net.resource.DiscreteResourceId;
 
-import java.util.List;
 import java.util.Optional;
 import java.util.Set;
 
@@ -48,7 +47,7 @@
     }
 
     @Override
-    public boolean containsAny(List<DiscreteResource> other) {
+    public boolean containsAny(Set<DiscreteResource> other) {
         return false;
     }
 
@@ -58,7 +57,7 @@
     }
 
     @Override
-    public DiscreteResources remove(List<DiscreteResource> removed) {
+    public DiscreteResources remove(Set<DiscreteResource> removed) {
         return this;
     }