[FLINK-12648][filesystem] Load Hadoop file system via org.apache.hado…

[jiasheng55]

…op.fs.FileSystem.get()

What is the purpose of the change

I think there are some duplicated codes in org.apache.flink.runtime.fs.hdfs.HadoopFsFactory#create with codes in apache hadoop-common dependency.

We can use org.apache.hadoop.fs.FileSystem#get(java.net.URI, org.apache.hadoop.conf.Configuration) to remove the duplicated codes.

Brief change log

Replace some codes with org.apache.hadoop.fs.FileSystem#get(java.net.URI, org.apache.hadoop.conf.Configuration)

Verifying this change

This change is already covered by existing tests, such as org.apache.flink.runtime.fs.hdfs.HadoopFsFactoryTest.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)

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