Switch from containers/image to go-containerregistry (#140)

* Vendor changes for go-containerregistry switch.

* Manual changes for go-containerregistry switch.

The biggest change is refactoring the tarball unpacking.

* Pull more of container-diff out.

* More vendor removals.

* More unit tests.

vendor/github.com/Microsoft/hcsshim/createsandboxlayer.go

@@ -1,35 +0,0 @@
-package hcsshim
-
-import "github.com/sirupsen/logrus"
-
-// CreateSandboxLayer creates and populates new read-write layer for use by a container.
-// This requires both the id of the direct parent layer, as well as the full list
-// of paths to all parent layers up to the base (and including the direct parent
-// whose id was provided).
-func CreateSandboxLayer(info DriverInfo, layerId, parentId string, parentLayerPaths []string) error {
-	title := "hcsshim::CreateSandboxLayer "
-	logrus.Debugf(title+"layerId %s parentId %s", layerId, parentId)
-
-	// Generate layer descriptors
-	layers, err := layerPathsToDescriptors(parentLayerPaths)
-	if err != nil {
-		return err
-	}
-
-	// Convert info to API calling convention
-	infop, err := convertDriverInfo(info)
-	if err != nil {
-		logrus.Error(err)
-		return err
-	}
-
-	err = createSandboxLayer(&infop, layerId, parentId, layers)
-	if err != nil {
-		err = makeErrorf(err, title, "layerId=%s parentId=%s", layerId, parentId)
-		logrus.Error(err)
-		return err
-	}
-
-	logrus.Debugf(title+"- succeeded layerId=%s parentId=%s", layerId, parentId)
-	return nil
-}