Reworked DatabaseService API.
Initial implementation of LockManager.
diff --git a/core/store/dist/pom.xml b/core/store/dist/pom.xml
index f0f37c7..10196c2 100644
--- a/core/store/dist/pom.xml
+++ b/core/store/dist/pom.xml
@@ -103,6 +103,12 @@
           <artifactId>hazelcast</artifactId>
         </dependency>
 
+        <dependency>
+          <groupId>net.jodah</groupId>
+          <artifactId>expiringmap</artifactId>
+          <version>0.3.1</version>
+        </dependency>
+
         <!-- for shaded copycat -->
         <dependency>
           <groupId>org.onlab.onos</groupId>