handle devices agreed to be inactive during master re-election

Change-Id: Ia193d7210a8319f04ce957f2bd4a0479b88d15a8
diff --git a/core/api/src/main/java/org/onlab/onos/net/device/DeviceService.java b/core/api/src/main/java/org/onlab/onos/net/device/DeviceService.java
index 8364935..54b9d72 100644
--- a/core/api/src/main/java/org/onlab/onos/net/device/DeviceService.java
+++ b/core/api/src/main/java/org/onlab/onos/net/device/DeviceService.java
@@ -42,6 +42,7 @@
      * @param deviceId device identifier
      * @return designated mastership role
      */
+    //XXX do we want this method here when MastershipService already does?
     MastershipRole getRole(DeviceId deviceId);