HADOOP-14774. S3A case "testRandomReadOverBuffer" failed due to improper range parameter.

Contributed by Yonger.

hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AInputStream.java

@@ -152,7 +152,7 @@ public class S3AInputStream extends FSInputStream implements CanSetReadahead {
     streamStatistics.streamOpened();
     try {
       GetObjectRequest request = new GetObjectRequest(bucket, key)
-          .withRange(targetPos, contentRangeFinish);
+          .withRange(targetPos, contentRangeFinish - 1);
       if (S3AEncryptionMethods.SSE_C.equals(serverSideEncryptionAlgorithm) &&
           StringUtils.isNotBlank(serverSideEncryptionKey)){
         request.setSSECustomerKey(new SSECustomerKey(serverSideEncryptionKey));