[ONOS-4438] Add REST API for mastership service

- Correct some typos in mastership codec

Change-Id: If8a0127d8d897d4b87cae71a194dfece6aa14f49
diff --git a/core/common/src/main/java/org/onosproject/codec/impl/RoleInfoCodec.java b/core/common/src/main/java/org/onosproject/codec/impl/RoleInfoCodec.java
index c63c078..2bed282 100644
--- a/core/common/src/main/java/org/onosproject/codec/impl/RoleInfoCodec.java
+++ b/core/common/src/main/java/org/onosproject/codec/impl/RoleInfoCodec.java
@@ -39,7 +39,7 @@
     private static final String MASTER = "master";
     private static final String BACKUPS = "backups";
 
-    private static final String MISSING_MEMBER_MESSAGE = " member is required in MastershipTerm";
+    private static final String MISSING_MEMBER_MESSAGE = " member is required in RoleInfo";
 
     @Override
     public ObjectNode encode(RoleInfo roleInfo, CodecContext context) {