Fix problems detected by the latest version of errorprone

Change-Id: I532d3627fa232e93ee6860bd10db64c99e78f915
(cherry picked from commit 1f8fcc3c6b200c401e2a65b3f9cabf10879d81de)
diff --git a/core/api/src/test/java/org/onosproject/cluster/RoleInfoTest.java b/core/api/src/test/java/org/onosproject/cluster/RoleInfoTest.java
index 3f5453e..9a14926 100644
--- a/core/api/src/test/java/org/onosproject/cluster/RoleInfoTest.java
+++ b/core/api/src/test/java/org/onosproject/cluster/RoleInfoTest.java
@@ -45,7 +45,8 @@
     public void testEquality() {
         new EqualsTester()
         .addEqualityGroup(RI1, new RoleInfo(new NodeId("n1"), Lists.newArrayList(N2, N3)))
-        .addEqualityGroup(RI3);
+        .addEqualityGroup(RI3)
+        .testEquals();
     }
 
     @Test