clean up .uploads directory in mysql and postgres tables
clean up .uploads directory in mysql and postgres tables

fix https://github.com/chrislusf/seaweedfs/issues/1957

When no uploads are running, you can run this SQL to clean up.
delete from <bucket_name> where directory like '/.uploads/%'

chrislusf/seaweedfs,chrislusf/seaweedfs,chrislusf/seaweedfs,chrislusf/seaweedfs