[FLINK-17802][kafka] Set offset commit only if group id is configured for new Kafka Table source

[leonardBang]

What is the purpose of the change

This pull request set enableCommitOnCheckpoints to be false if group.id was not specified.

Brief change log

update file:

• org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumerBase.java
• org/apache/flink/streaming/connectors/kafka/table/KafkaDynamicSourceBase.java

Verifying this change

Add unit case to cover

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 / docs / JavaDocs / not documented)

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Automated Checks

Last check on commit 49d9690 (Fri Oct 16 10:56:02 UTC 2020)

Warnings:

• No documentation files were touched! Remember to keep the Flink docs up to date!

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Review Progress

• ❓ 1. The [description] looks good.
• ❓ 2. There is [consensus] that the contribution should go into to Flink.
• ❓ 3. Needs [attention] from.
• ❓ 4. The change fits into the overall [architecture].
• ❓ 5. Overall code [quality] is good.

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CI report:

• 49d9690 Azure: FAILURE

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[gyfora]

Looks good +1

[wuchong]

@flinkbot run azure

[wuchong]

LGTM.

[leonardBang]

@flinkbot run azure

[wuchong]

The failed python test is unrelated. Others are passed. Merging...