Remove explicit type parameters which can be inferred

Change-Id: I62cd4df252bab6208e1b1cd37f8f8757b0cfc17e
diff --git a/core/net/src/test/java/org/onosproject/net/flow/impl/FlowRuleManagerTest.java b/core/net/src/test/java/org/onosproject/net/flow/impl/FlowRuleManagerTest.java
index 014cb95..88a7e7a 100644
--- a/core/net/src/test/java/org/onosproject/net/flow/impl/FlowRuleManagerTest.java
+++ b/core/net/src/test/java/org/onosproject/net/flow/impl/FlowRuleManagerTest.java
@@ -554,14 +554,14 @@
             @Override
             public CompletedBatchOperation get()
                     throws InterruptedException, ExecutionException {
-                return new CompletedBatchOperation(true, Collections.<FlowRule>emptySet(), null);
+                return new CompletedBatchOperation(true, Collections.emptySet(), null);
             }
 
             @Override
             public CompletedBatchOperation get(long timeout, TimeUnit unit)
                     throws InterruptedException,
                     ExecutionException, TimeoutException {
-                return new CompletedBatchOperation(true, Collections.<FlowRule>emptySet(), null);
+                return new CompletedBatchOperation(true, Collections.emptySet(), null);
             }
 
             @Override