Vendor in latest containers/buildah code

This should improve the speed of podman build.
Has fixes from containres/image for parallell pull.

Also vendor containers/storage and containers/image

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/containers/buildah/imagebuildah/build.go

@@ -1307,7 +1307,12 @@ func (b *Executor) Build(ctx context.Context, stages imagebuilder.Stages) (strin
 
 	var imageRef reference.Canonical
 	imageID := ""
-	if !b.layers && !b.noCache {
+
+	// Check if we have a one line Dockerfile making layers irrelevant
+	// or the user told us to ignore layers.
+	ignoreLayers := (len(stages) < 2 && len(stages[0].Node.Children) < 2) || (!b.layers && !b.noCache)
+
+	if ignoreLayers {
 		imgID, ref, err := stageExecutor.Commit(ctx, stages[len(stages)-1].Builder, "")
 		if err != nil {
 			return "", nil, err

vendor/github.com/containers/buildah/imagebuildah/chroot_symlink.go

@@ -131,6 +131,11 @@ func resolveModifiedTime(rootdir, filename, historyTime string) (bool, error) {
 func modTimeIsGreater(rootdir, path string, historyTime string) (bool, error) {
 	var timeIsGreater bool
 
+	// the Walk below doesn't work if rootdir and path are equal
+	if rootdir == path {
+		return false, nil
+	}
+
 	// Convert historyTime from string to time.Time for comparison
 	histTime, err := time.Parse(time.RFC3339Nano, historyTime)
 	if err != nil {