hbase-cleanup.sh did not clean the wal dir if hbase.wal.dir configured individually

If 'hbase.wal.dir' and 'hbase.rootdir' are configured to different filesystem or directories, hbase clean script will clean the directory of 'hbase.rootdir' only, the directory of 'hbase.wal.dir'  will be left.

The left direcotries 'WAls,' 'oldWALs', and recovered.edits under region dir should be cleaned also.