explicitly wrap flush  LocalFileOpener (#1070)
explicitly wrap flush  LocalFileOpener (#1070)

* explicitly wrap flush and name of LocalFileOpener

* revert explicit wrapping of local name

Co-authored-by: Peter Barmettler <bc8b2d2f1b8ed44af366f37483d51dab3c5019e9@raccoonworks.ch>
fsspec/filesystem_spec,fsspec/filesystem_spec