HDFS-10914. Move remnants of oah.hdfs.client to hadoop-hdfs-client.

(cherry picked from commit 92e5e91598)

 Conflicts:
	hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsAdmin.java

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/CreateEncryptionZoneFlag.java

@@ -68,4 +68,3 @@ public enum CreateEncryptionZoneFlag {
     return mode;
   }
 }
-

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsAdmin.java

@@ -45,14 +45,13 @@ import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.EncryptionZone;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.security.AccessControlException;
-import org.apache.hadoop.hdfs.tools.DFSAdmin;
 
 /**
  * The public API for performing administrative functions on HDFS. Those writing
  * applications against HDFS should prefer this interface to directly accessing
  * functionality in DistributedFileSystem or DFSClient.
  *
- * Note that this is distinct from the similarly-named {@link DFSAdmin}, which
+ * Note that this is distinct from the similarly-named DFSAdmin, which
  * is a class that provides the functionality for the CLI `hdfs dfsadmin ...'
  * commands.
  */

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsUtils.java

@@ -20,8 +20,7 @@ package org.apache.hadoop.hdfs.client;
 import java.io.IOException;
 import java.net.URI;
 
-import org.apache.commons.logging.Log;
+import org.apache.commons.io.IOUtils;
-import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
@@ -30,7 +29,8 @@ import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
-import org.apache.hadoop.io.IOUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * The public utility API for HDFS.
@@ -38,7 +38,7 @@ import org.apache.hadoop.io.IOUtils;
 @InterfaceAudience.Public
 @InterfaceStability.Evolving
 public class HdfsUtils {
-  private static final Log LOG = LogFactory.getLog(HdfsUtils.class);
+  public static final Logger LOG = LoggerFactory.getLogger(HdfsUtils.class);
 
   /**
    * Is the HDFS healthy?
@@ -80,7 +80,7 @@ public class HdfsUtils {
       }
       return false;
     } finally {
-      IOUtils.cleanup(LOG, fs);
+      IOUtils.closeQuietly(fs);
     }
   }
 }