HDFS-11953. Remove Guava v21 usage from HDFS-7240. Contributed by Xiaoyu Yao.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/OzoneClientUtils.java

@@ -382,7 +382,7 @@ public final class OzoneClientUtils {
     if ((value == null) || value.isEmpty()) {
       return Optional.absent();
     }
-    return Optional.of(HostAndPort.fromString(value).getHost());
+    return Optional.of(HostAndPort.fromString(value).getHostText());
   }
 
   /**