This fix adds the missing fields of `Hostname`, `OpenStdin`, `Hosts`, `Groups`, and `Healthcheck` to `ContainerSpec`. This fix also moves the `Label` in `ContainerSpec` to align with the definition order. Signed-off-by: Yong Tang <yong.tang.github@outlook.com> Upstream-commit: 897e69143a15bbf5f4efe91664e3de2aba7264a1 Component: engine