skip the volumes mounted when deleting the volumes of container.
use Binds key in hostConfig to detect volumes mounted from external.
fix layer size computation: handle hard links

This change makes docker compute layer size correctly.

The old code isn't taking hard links into account. Layers could
seem like they're up to 1-1.5x larger than they really were.
fix container size computation: handle hard links

This change makes docker compute container size correctly.

The old code isn't taking hard links into account. Containers could
seem like they're up to 1-1.5x larger than they really were.
Merge pull request #2304 from unclejack/fix_layer_size_computation

Fix layer size computation: handle hard links correctly
Merge pull request #2488 from viirya/fix_container_volumes_delete

Skip the volumes mounted when deleting the volumes of container.