CDPD-12385 Add Hadoop File System extended attributes support.

[mukund-thakur]

Deleted the GoogleHadoopFileSystemIntegrationHadoop2Test as it broken and has
been moved to new class in later versions.

Change on 2019/02/13 by idv <idv@google.com>

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=233877650

Conflicts:
gcs/CHANGES.txt
gcs/src/main/java/com/google/cloud/hadoop/fs/gcs/GoogleHadoopFileSystemBase.java

[mukund-thakur]

Initial discussions are present here. https://github.com/hortonworks/bigdata-interop/pull/9

I had to remove the test as it is broken. It is an integration test but it runs as a unit test as well. I think that is the reason this test has been moved to a new class in latest version.
GoogleCloudDataproc#388

In fact all unit tests are broken in hdp-3.1-maint. To run them I had to add an extra test dependency on "hamcrest-all" in my local. Post that all unit tests work fine.

So we have to get in by trusting the manual testing effort by myself and customer.

CC @shwethags @sidseth

[mukund-thakur]

Got +1 here https://github.com/hortonworks/bigdata-interop/pull/9