rgw: allow force-check filter to pass through the SAL layer

rgw: allow force-check filter to pass through the SAL layer

The zipper updates did not pass a force-check filter from
RGWRados::Bucket::List through to
RGWRados::cls_bucket_list_ordered. This filter is necessary for the
"radosgw-admin bucket check --fix..." functionality.

Declares type RGWBucketListNameFilter to encapsualte the filter
type. Renames some fields so the two filters can be distinguished.

Signed-off-by: J. Eric Ivancich <ivancich@redhat.com>