removing a dead local variable, refactoring

Change-Id: If48284ae996e74f63ca7b0993a7f9e69e4954cbd
diff --git a/cli/src/main/java/org/onosproject/cli/MastersListCommand.java b/cli/src/main/java/org/onosproject/cli/MastersListCommand.java
index 1357d64..c21ef93 100644
--- a/cli/src/main/java/org/onosproject/cli/MastersListCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/MastersListCommand.java
@@ -66,7 +66,6 @@
                           List<ControllerNode> nodes) {
         ObjectMapper mapper = new ObjectMapper();
         ArrayNode result = mapper.createArrayNode();
-        ControllerNode self = service.getLocalNode();
         for (ControllerNode node : nodes) {
             List<DeviceId> ids = Lists.newArrayList(mastershipService.getDevicesOf(node.id()));
             result.add(mapper.createObjectNode()