webdav: add a small pause after failed upload before deleting file #2517
webdav: add a small pause after failed upload before deleting file #2517

This fixes the integration tests for `serve webdav` which uses the
webdav backend tests.

B4dM4n/rclone,B4dM4n/rclone,olihey/rclone,ncw/rclone,olihey/rclone,olihey/rclone,ncw/rclone,B4dM4n/rclone,ncw/rclone,ncw/rclone,olihey/rclone,B4dM4n/rclone