Replace copied code with manifest-tool library

Signed-off-by: Avi Deitcher <avi@deitcher.net>

Author: deitch

src/cmd/linuxkit/pkglib/docker.go

@@ -16,6 +16,7 @@ import (
 
 	"github.com/docker/cli/cli/config"
 	dockertypes "github.com/docker/docker/api/types"
+	"github.com/estesp/manifest-tool/pkg/registry"
 	"github.com/estesp/manifest-tool/pkg/types"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	log "github.com/sirupsen/logrus"
@@ -247,7 +248,7 @@ func manifestPush(img string, auth dockertypes.AuthConfig) (hash string, length
 	}
 
 	// push the manifest list with the auth as given, ignore missing, do not allow insecure
-	return pushManifestList(auth, yamlInput, true, false, false, "")
+	return registry.PushManifestList(auth.Username, auth.Password, yamlInput, true, false, false, "")
 }
 
 func signManifest(img, digest string, length int, auth dockertypes.AuthConfig) error {

src/cmd/linuxkit/pkglib/manifest.go

@@ -31,7 +31,7 @@ github.com/docker/go-events e31b211e4f1cd09aa76fe4ac244571fab96ae47f
 github.com/docker/go-metrics d466d4f6fd960e01820085bd7e1a24426ee7ef18
 github.com/docker/go-units 9e638d38cf6977a37a8ea0078f3ee75a7cdb2dd1
 github.com/docker/libtrust aabc10ec26b754e797f9028f4589c5b7bd90dc20
-github.com/estesp/manifest-tool bae5531170d45955c2d72d1b29d77ce1b0c9dedb
+github.com/estesp/manifest-tool 2d360eeba276afaf63ab22270b7c6b4f8447e261
 github.com/fvbommel/sortorder 6b6b45a52fcc54f788363c1880630248b63402a1
 github.com/go-ini/ini afbc45e87f3ba324c532d12c71918ef52e0fb194
 github.com/gogo/protobuf v1.3.1