Refactored primitive builders to consolidate methods into the base DistributedPrimitiveBuilder

Change-Id: I9a24117b41d1feeb5cf460c6adfa484aabcbb8c1
diff --git a/apps/dhcp/app/src/main/java/org/onosproject/dhcp/impl/DistributedDhcpStore.java b/apps/dhcp/app/src/main/java/org/onosproject/dhcp/impl/DistributedDhcpStore.java
index d922b8f..8c880a5 100644
--- a/apps/dhcp/app/src/main/java/org/onosproject/dhcp/impl/DistributedDhcpStore.java
+++ b/apps/dhcp/app/src/main/java/org/onosproject/dhcp/impl/DistributedDhcpStore.java
@@ -89,7 +89,8 @@
         freeIPPool = storageService.<Ip4Address>setBuilder()
                 .withName("onos-dhcp-freeIP")
                 .withSerializer(Serializer.using(KryoNamespaces.API))
-                .build();
+                .build()
+                .asDistributedSet();
 
         log.info("Started");
     }