The consolidated commits in this backport are as follows:
HADOOP-14787. AliyunOSS: Implement the `createNonRecursive` operator.
HADOOP-14649. Update aliyun-sdk-oss version to 2.8.1. (Genmao Yu via rchiang)
HADOOP-14194. Aliyun OSS should not use empty endpoint as default. Contributed by Genmao Yu
HADOOP-14466. Remove useless document from TestAliyunOSSFileSystemContract.java. Contributed by Chen Liang.
HADOOP-14458. Add missing imports to TestAliyunOSSFileSystemContract.java. Contributed by Mingliang Liu.
HADOOP-14192. AliyunOSS FileSystem contract test should implement getTestBaseDir(). Contributed by Mingliang Liu
HADOOP-14072. AliyunOSS: Failed to read from stream when seek beyond the download size. Contributed by Genmao Yu
HADOOP-13769. AliyunOSS: update oss sdk version. Contributed by Genmao Yu
HADOOP-14069. AliyunOSS: listStatus returns wrong file info. Contributed by Fei Hui
HADOOP-13768. AliyunOSS: handle the failure in the batch delete operation `deleteDirs`. Contributed by Genmao Yu
HADOOP-14065. AliyunOSS: oss directory filestatus should use meta time. Contributed by Fei Hui
HADOOP-14045. Aliyun OSS documentation missing from website. Contributed by Yiqun Lin.
HADOOP-13723. AliyunOSSInputStream#read() should update read bytes stat correctly. Contributed by Mingliang Liu
HADOOP-13624. Rename TestAliyunOSSContractDispCp. Contributed by Genmao Yu
HADOOP-13591. Unit test failure in TestOSSContractGetFileStatus and TestOSSContractRootDir. Contributed by Genmao Yu
HADOOP-13481. User documents for Aliyun OSS FileSystem. Contributed by Genmao Yu.
HADOOP-12756. Incorporate Aliyun OSS file system implementation. Contributed by Mingfei Shi and Lin Zhou
(cherry picked from commit 30ab9b6aef)
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