[FLINK-15298][docs] Fix dependences in the DataStream API Tutorial doc

[qinjunjerry]

What is the purpose of the change

This pull request fixes the maven dependence issues in the DataStream API tutorial doc where:

• The scope should be 'provided' for flink-java and flink-streaming-java
• The dependency flink-client is not needed

Brief change log

• Added provided
• Removed the flink-client dependency

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

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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Last check on commit f58a3ea (Fri Feb 28 21:47:22 UTC 2020)

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[NicoK]

+1 on the removal of flink-clients. However, there is a problem with setting the other two to provided:

With these dependencies set to provided, you cannot run the example out of the box in (at least) IntelliJ anymore: you either need to enable the add-dependencies-for-IDEA profile (not recommended) or tick Include dependencies with "Provided" scope in the run configuration. We currently do not describe this anywhere.

Also, the command given for running the example ( mvn exec:java -Dexec.mainClass=wikiedits.WikipediaAnalysis) does not work anymore. So maybe as a different approach, keep the default scope and instead mention this for the bonus exercise ("Running on a Cluster").

[NicoK]

sorry for not re-reviewing it earlier - since 1.9 is a bit too old now, let me close this PR