Bump image, storage, and image-spec

Bump containers/image (pulling in its new dependency on ostree-go),
containers/storage, and updated image-spec.

This pulls in the OCI v1.0 specifications and code that allows us to
support 1.0 images.

Signed-off-by: Dan Walsh <dwalsh@redhat.com>
Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

vendor/github.com/containers/image/transports/transports.go

@@ -2,6 +2,7 @@ package transports
 
 import (
 	"fmt"
+	"sort"
 	"sync"
 
 	"github.com/containers/image/types"
@@ -69,3 +70,15 @@ func Register(t types.ImageTransport) {
 func ImageName(ref types.ImageReference) string {
 	return ref.Transport().Name() + ":" + ref.StringWithinTransport()
 }
+
+// ListNames returns a list of transport names
+func ListNames() []string {
+	kt.mu.Lock()
+	defer kt.mu.Unlock()
+	var names []string
+	for _, transport := range kt.transports {
+		names = append(names, transport.Name())
+	}
+	sort.Strings(names)
+	return names
+}