Log Message:
py-fs: updated to 2.4.15

2.4.15

Changed
- Support more lenient usernames and group names in FTP servers

Fixed
- Fixed `MemoryFS.move` and `MemoryFS.movedir` not updating the name of moved
  resources, causing `MemoryFS.scandir` to use the old name.
- Make `WrapFS.move` and `WrapFS.movedir` use the delegate FS methods instead
  of `fs.move` functions, which was causing optimized implementation of
  `movedir` to be always skipped.