Any reason not to put this in `S3AsyncBlobStore`? I know you mentioned that this _does_ work as intended for generic S3 providers...is that because other S3-compatible blobstores implement `putBucketInRegion` (which seems to be the [actual call made](https://github.com/jclouds/jclouds/blob/master/apis/s3/src/main/java/org/jclouds/s3/blobstore/S3AsyncBlobStore.java#L271)) differently?