bulkLoadHFile API should ensure that rs has the source hfile's write permission

If the rs bulk load a HFile but has no write permission of it, we can read & compact the hfile, but after the compaction finished, the HFile willl be moved to archive directory, the HFileCleaner won't has permission to delete, then the HFile will always be keep in HDFS.

Need check the file's write permission when run bulkLoadHFile at server side, if no write permission, then reject.