[FLINK-19158][e2e] Fix wget timeout mechanism and cache config

[rmetzger]

What is the purpose of the change

Increase stability of java e2e tests

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Automated Checks

Last check on commit 0fa938c (Fri May 28 07:11:26 UTC 2021)

Warnings:

• No documentation files were touched! Remember to keep the Flink docs up to date!
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• ❓ 1. The [description] looks good.
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• ❓ 3. Needs [attention] from.
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CI report:

• 0fa938c Azure: FAILURE

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[rmetzger]

Thanks for the review & approval.

I reported the build failure here: https://issues.apache.org/jira/browse/FLINK-21051

[rmetzger]

Merging now