Various small fixes

Change-Id: I83802169d0d968f7b88d4be2cedba74b15fdd7da
diff --git a/core/api/src/test/java/org/onosproject/store/service/TestEventuallyConsistentMap.java b/core/api/src/test/java/org/onosproject/store/service/TestEventuallyConsistentMap.java
index b28356d..352210d 100644
--- a/core/api/src/test/java/org/onosproject/store/service/TestEventuallyConsistentMap.java
+++ b/core/api/src/test/java/org/onosproject/store/service/TestEventuallyConsistentMap.java
@@ -86,6 +86,7 @@
         return map.get(key);
     }
 
+    @SuppressWarnings("ReturnValueIgnored")
     @Override
     public void put(K key, V value) {
         map.put(key, value);