Fixing hadoop 3 Dockerfile

[cryptoe]

As part of #11791 , the DockerFIle for hadoop 3 was referring to paths which are outside its build context. The fix here is to duplicate the template files across both hadoop/hadoop3 folders.
I am open to suggestion if there are other workarounds available.

Description

Fixed the bug ...

Renamed the class ...

Added a forbidden-apis entry ...

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Key changed/added classes in this PR

• dockerfile

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This PR has:

• been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.