This change reduces the flickering of the terminal when
running `docker stats` by buffering the formatted stats
text and printing it in one write.
Should also consume less CPU as we now only have to issue
a single syscall to write the stats text to the terminal.
Signed-off-by: Giedrius Jonikas <giedriusj1@gmail.com>
(cherry picked from commit 0b16070ae6)
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
470ab05503