sftp: Remove legacy filename/dirname methods
sftp: Remove legacy filename/dirname methods

fawick/restic,restic/restic,ar-jan/restic,middelink/restic,ar-jan/restic,fawick/restic,middelink/restic,kurin/restic,restic/restic,kurin/restic,jayme-github/restic,jayme-github/restic