Fix another typo in gtod_reduce()

Forgot one of the variables. Impressive.

Signed-off-by: Jens Axboe <axboe@fb.com>
Fix early termination of cpu id string

Commit 2d60ad8e terminated the cpu id string at 12 chars,
but the output from cpuid is 12 chars. So we need one more
character, if we want it null terminated and strcmp()
working.

Signed-off-by: Jens Axboe <axboe@fb.com>
librbd ioengine support

Signed-off-by: Daniel Gollub <d.gollub@telekom.de>
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)
add example job file for the RBD engine

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