Load content hash as the etag of the object when the UFS is S3 in 2.8 #11353

Job	Run time
modules: (alluxio.client.cli.,!alluxio.client.cli.fs.)	10m 10s
modules: (alluxio.client.cli.fs.**)	9m 39s
modules: (alluxio.client.fs.,!alluxio.client.fs.concurrent.,!alluxio.client.fs.io.**)	9m 47s
modules: (alluxio.client.fs.concurrent.,alluxio.client.fs.io.)	9m 51s
modules: (alluxio.client.,!alluxio.client.fs.,!alluxio.client.cli.,!alluxio.client.fuse.)	6m 54s
modules: (alluxio.job.,alluxio.master.,alluxio.stress.**)	10m 41s
modules: (alluxio.server.ft.,!alluxio.server.ft.journal.raft.,!alluxio.server.ft.journal.ufs...	13m 6s
modules: (alluxio.server.ft.journal.raft.,alluxio.server.ft.journal.ufs.)	17m 53s
modules: (alluxio.server.,!alluxio.server.ft.)	7m 28s
	1h 35m 29s

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