[FLINK-19158][e2e] Increase download timeouts

[rmetzger]

What is the purpose of the change

Increase build stability: some Java e2e tests were failing due to timeout errors.
With this PR, we are more generous with the timeouts.

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Last check on commit c6fd854 (Tue Sep 15 05:51:06 UTC 2020)

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[zentol]

+1

[rmetzger]

Thanks a lot for your review. Merging!