contrib: load image history from 'manifest.json' first due to docker 1.10 changes.
contrib: load image history from 'manifest.json' first due to
docker 1.10 changes.

Fixes #69

Signed-off-by: liangchenye <49f3f795d1fda22b7f7dfee719201384e22b7d55@huawei.com>

jgsqware/clair,Quentin-M/clair