Use buildah commit and bud in podman

Vendor in buildah and use as much of commit and bug as possible for podman
build and commit.

Resolves #586
Signed-off-by: baude <bbaude@redhat.com>

Closes: #681
Approved by: mheon

vendor/github.com/fsouza/go-dockerclient/change.go

@@ -0,0 +1,43 @@
+// Copyright 2014 go-dockerclient authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package docker
+
+import "fmt"
+
+// ChangeType is a type for constants indicating the type of change
+// in a container
+type ChangeType int
+
+const (
+	// ChangeModify is the ChangeType for container modifications
+	ChangeModify ChangeType = iota
+
+	// ChangeAdd is the ChangeType for additions to a container
+	ChangeAdd
+
+	// ChangeDelete is the ChangeType for deletions from a container
+	ChangeDelete
+)
+
+// Change represents a change in a container.
+//
+// See https://goo.gl/Wo0JJp for more details.
+type Change struct {
+	Path string
+	Kind ChangeType
+}
+
+func (change *Change) String() string {
+	var kind string
+	switch change.Kind {
+	case ChangeModify:
+		kind = "C"
+	case ChangeAdd:
+		kind = "A"
+	case ChangeDelete:
+		kind = "D"
+	}
+	return fmt.Sprintf("%s %s", kind, change.Path)
+}