fix(storage): fix VERSION fixtures in several tests

[plamut]

Fixes#10090

A recent change to IAM objects in API core started causing an error if accessing those objects as dicts, if their version is > 1. This commit addresses that by setting the VERSION to 1 in fixtures.

PR checklist

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[plamut]

The system tests failure (Python 3.6 only) is caused by the rate limit:

429 ... The project exceeded the rate limit for creating and deleting buckets.

[plamut]

Not reproducible anymore on master, thus closing.