[FLINK-18333][jdbc] UnsignedTypeConversionITCase failed caused by MariaDB4j "Asked to waitFor Program"

[leonardBang]

What is the purpose of the change

• This pull request fix up unstable test UnsignedTypeConversionITCase.

Brief change log

• Avoid using MariaDB4jRule to create a DB instance, because the MariaDB4jRule will pull up a ManagedProcess to run the create db statement which may exit unexpected.
• Add retry logic for initializing the DB instance.

Verifying this change

This change is an unstable test fix.

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 f5fee13 (Wed Aug 26 03:47:11 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:

• 9c6afc2 Azure: FAILURE

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[leonardBang]

cc @wuchong Could you help review this PR?

[wuchong]

Thanks for the contribution. I left some minor comments.

[rmetzger]

The test failure seems unrelated.

+1 to merge this change.

[wuchong]

LGTM.

Merging...