S3 integration component is always loaded

[ss89]

When i write an integration test component the s3 component is always loaded even though my config that is used does not have any cloud configuration.

This seems to come from the relatively new PostProcessor UseLocalstackDefaultsConfigPostProcessor.

It is adding the cloud.aws.s3 config keys because of the init func of the pkg/cloud/aws/s3/client.go, which is executed due to the fixture loaders all lying in the same directory.

So as soon as one fixture loader is used, the setting is set and a minio container will be started, even if not needed.