HADOOP-15844. tag S3GuardTool entry points as limitedPrivate("management-tools")/evolving

Change-Id: Ic58bbd917da901a1bd2322ae0f41ca00e60dcc06

Author: steveloughran

hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/S3GuardTool.java

@@ -41,6 +41,8 @@
 import org.slf4j.LoggerFactory;
 
 import org.apache.commons.lang3.StringUtils;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
 import org.apache.hadoop.fs.FileStatus;
@@ -70,6 +72,8 @@
 /**
  * CLI to manage S3Guard Metadata Store.
  */
+@InterfaceAudience.LimitedPrivate("management tools")
+@InterfaceStability.Evolving
 public abstract class S3GuardTool extends Configured implements Tool {
   private static final Logger LOG = LoggerFactory.getLogger(S3GuardTool.class);