YARN-5206. RegistrySecurity includes id:pass in exception text if considered invalid. Contributed by Steve Loughran

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/client/impl/zk/RegistrySecurity.java

@@ -443,7 +443,7 @@ public class RegistrySecurity extends AbstractService {
    */
   public String digest(String idPasswordPair) throws IOException {
     if (StringUtils.isEmpty(idPasswordPair) || !isValid(idPasswordPair)) {
-      throw new IOException("Invalid id:password: " + idPasswordPair);
+      throw new IOException("Invalid id:password");
     }
     try {
       return DigestAuthenticationProvider.generateDigest(idPasswordPair);