folders/files > bucket-size get tacked onto last bucket

[MichaelSEA]

(reported by @Dk-Qumulo))

in some cases, a file or folder larger than [bucket size] gets tacked onto the last bucket of a qsplit, making the parallelized rsync transfers very uneven.

If it is a discrete file that is larger than a bucket there is not much we can do with our current approach.

But if it is a directory with children, we should be able to split it across buckets as normal.

The investigation here is to determine why a directory is not being split.