using ListAllMyBuckets prevents tighten the policies

[teodorescuserban]

It looks like the plugin is using the ListAllMyBuckets.
I don't see a valid reason why it would attempt to do that, since we are providing the bucket name already in the plugin configuration.
As you know, the ListAllMyBuckets can only take a wildcard as resource argument, which means all buckets names in the account can be seen.

Any chance to fix that?

[teodorescuserban]

Oh I see, you are using a buckets.all().
Ok to do a PR?