sheep/cluster: fix error in sheep log

zk_timeout is measured in milliseconds, so
it should be divided by 1000 to seconds.

Signed-off-by: Bingpeng Zhu <bingpeng.zbp@alibaba-inc.com>
tests/func: fix spurious error for 032

Signed-off-by: Liu Yuan <namei.unix@gmail.com>
Reviewed-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>
Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>