erp5_wendelin_tutorial: fix bug in the tutorial Howto.Create.Data.Product and add incomplete test Transform.Data

(Test speed becomes network dependant rather than storage evaluated). Thus use initial default for now.

Revert "Increase from 1MB to 10MB upload file size."

This reverts commit 42d6afa4.

Revert "(Test speed becomes network dependant rather than storage evaluated). Thus use initial default for now."

This reverts commit 703c4c7a.

(Test speed becomes network dependant rather than storage evaluated). Thus use initial default for now.
Revert "Add default wendelin cluster configuration which is to be used on a Test Suite."

This reverts commit bb47a80d.

Tests passing locally thus safe to merge/

/reviewed-on nexedi/wendelin!37

Add minimal security.

Upload 1Mb of data.

Add dependencies.