[FLINK-13927] Add note about hadoop dependencies for local debug

[azagrebin]

What is the purpose of the change

Currently if user tries to run the job locally (e.g. from IDE) and uses Hadoop fs, it will not work if hadoop dependencies are not on the class path which is the case for the example from the quick start.

Brief change log

We can add a hint about adding provided hadoop dependencies in this case (+ Idea hint about provided included checkbox in run/debug app setup) to docs/ops/deployment/hadoop.md.

Verifying this change

Run ./docs/build_docs.sh -i and open in browser to check the doc changes.

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? (docs)

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Automated Checks

Last check on commit 3c991dc (Wed Oct 16 08:13:08 UTC 2019)

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CI report:

• c7d82ef : FAILURE Build

[aljoscha]

This looks good!

[azagrebin]

Thanks for the review @aljoscha
merged into master by 3c991dc