fio.1: add rbd options to man page

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

(cherry picked from commit 6e44a82a724b7ad0a559c22eec694e8afa7d2a20
git@github.com:dalgaaf/fio.git)
Signed-off-by: Jens Axboe <axboe@fb.com>
1 file changed