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Detailed discussions in HADOOP-14999 and HADOOP-15027.
share SemaphoredDelegatingExecutor and move it to hadoop-common.
cc Steve Loughran
AliyunOSS: provide one asynchronous multi-part based uploading mechanism
AliyunOSS: Support multi-thread pre-read to improve sequential read from Hadoop to Aliyun OSS performance
backport HADOOP-15039 to branch-2 and branch-3