cmd/dfuse: add a dummy Fsync till I figure out what I really need.
cmd/dfuse: add a dummy Fsync till I figure out what I really need.

Change-Id: I7ed8dd16a7ce049a61af890d49aa8646e3948afa
Reviewed-on: https://upspin-review.git.corp.google.com/1861
Reviewed-by: Eduardo Pinheiro <55040cbb39ba395339ae7940d8da6cd97797a4a8@google.com>

upspin/upspin,upspin/upspin