HADOOP-11180. Change log message "token.Token: Cannot find class for token kind kms-dt" to debug. Contributed by Yi Liu.

(cherry picked from commit 3bfd29949fef6d8fb5df4c6398e77cde320d8c2d)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java

@@ -121,7 +121,7 @@ public class Token<T extends TokenIdentifier> implements Writable {
       cls = tokenKindMap.get(kind);
     }
     if (cls == null) {
-      LOG.warn("Cannot find class for token kind " + kind);
+      LOG.debug("Cannot find class for token kind " + kind);
       return null;
     }
     return cls;