Add distributed lock primitive

Change-Id: I60f4581d5acb5fc9b9a21d4191874bb56348af58
diff --git a/protocols/pcep/server/ctl/src/test/java/org/onosproject/pcelabelstore/util/StorageServiceAdapter.java b/protocols/pcep/server/ctl/src/test/java/org/onosproject/pcelabelstore/util/StorageServiceAdapter.java
index 2f97c7d..4ba8a2c 100644
--- a/protocols/pcep/server/ctl/src/test/java/org/onosproject/pcelabelstore/util/StorageServiceAdapter.java
+++ b/protocols/pcep/server/ctl/src/test/java/org/onosproject/pcelabelstore/util/StorageServiceAdapter.java
@@ -25,6 +25,7 @@
 import org.onosproject.store.service.ConsistentMapBuilder;
 import org.onosproject.store.service.ConsistentMultimapBuilder;
 import org.onosproject.store.service.ConsistentTreeMapBuilder;
+import org.onosproject.store.service.DistributedLockBuilder;
 import org.onosproject.store.service.DistributedSetBuilder;
 import org.onosproject.store.service.DocumentTreeBuilder;
 import org.onosproject.store.service.EventuallyConsistentMapBuilder;
@@ -80,6 +81,11 @@
     }
 
     @Override
+    public DistributedLockBuilder lockBuilder() {
+        return null;
+    }
+
+    @Override
     public LeaderElectorBuilder leaderElectorBuilder() {
         return null;
     }