New public dataset exports fail with "This version of git-annex cannot auto-enable S3 bucket versioning"

[nellh]

Describe the bug Seeing this on some newly created remotes when the public remote is added.

To Reproduce Steps to reproduce the behavior:

1. Upload a new dataset
2. Make it public
3. S3 export will not occur until a second snapshot is made or it is manually re-exported

Expected behavior S3 versioning is enabled on this bucket, so the export should succeed even if initremote is reports this problem. Subsequent export calls succeed.