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/client_unix.go

@@ -0,0 +1,32 @@
+// Copyright 2016 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.
+
+// +build !windows
+
+package docker
+
+import (
+	"context"
+	"net"
+	"net/http"
+)
+
+// initializeNativeClient initializes the native Unix domain socket client on
+// Unix-style operating systems
+func (c *Client) initializeNativeClient(trFunc func() *http.Transport) {
+	if c.endpointURL.Scheme != unixProtocol {
+		return
+	}
+	sockPath := c.endpointURL.Path
+
+	tr := trFunc()
+
+	tr.Dial = func(network, addr string) (net.Conn, error) {
+		return c.Dialer.Dial(unixProtocol, sockPath)
+	}
+	tr.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+		return c.Dialer.Dial(unixProtocol, sockPath)
+	}
+	c.HTTPClient.Transport = tr
+}