Specified `--type=container` for `docker inspect` command.
Specified `--type=container` for `docker inspect` command.

Without `--type` option, `docker inspect` is generic and will match
against any object types. However in our case, we only care about
Docker container rather than any other object types, so we need to
add `--type=container` so that `docker inspect` will only match Docker
container.

Review: https://reviews.apache.org/r/68872

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