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/ostreedev/ostree-go/pkg/glibobject/glibobject.go.h

@@ -0,0 +1,17 @@
+#include <glib.h>
+
+static char *
+_g_error_get_message (GError *error)
+{
+  g_assert (error != NULL);
+  return error->message;
+}
+
+static const char *
+_g_variant_lookup_string (GVariant *v, const char *key)
+{
+  const char *r;
+  if (g_variant_lookup (v, key, "&s", &r))
+    return r;
+  return NULL;
+}