base for mastership term implementation

Change-Id: Ie354096ad8835536839e3c1504e19a2cbff866c1
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipService.java b/core/api/src/main/java/org/onlab/onos/cluster/MastershipService.java
index 31b4bcc..be91609 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/MastershipService.java
+++ b/core/api/src/main/java/org/onlab/onos/cluster/MastershipService.java
@@ -56,6 +56,13 @@
     Set<DeviceId> getDevicesOf(NodeId nodeId);
 
     /**
+     * Returns the mastership term service for getting term information.
+     *
+     * @return the MastershipTermService for this mastership manager
+     */
+    MastershipTermService requestTermService();
+
+    /**
      * Adds the specified mastership change listener.
      *
      * @param listener the mastership listener