Re-think integration vendoring

- remove docker/docker from  Traefik vendor (unused)
- use `ignore` for all Traefik vendor in integration glide.
- defined only integration specific version of the dependencies.

integration/vendor/github.com/opencontainers/runc/delete.go

@@ -0,0 +1,84 @@
+// +build !solaris
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"syscall"
+	"time"
+
+	"github.com/opencontainers/runc/libcontainer"
+	"github.com/urfave/cli"
+)
+
+func killContainer(container libcontainer.Container) error {
+	_ = container.Signal(syscall.SIGKILL, false)
+	for i := 0; i < 100; i++ {
+		time.Sleep(100 * time.Millisecond)
+		if err := container.Signal(syscall.Signal(0), false); err != nil {
+			destroy(container)
+			return nil
+		}
+	}
+	return fmt.Errorf("container init still running")
+}
+
+var deleteCommand = cli.Command{
+	Name:  "delete",
+	Usage: "delete any resources held by the container often used with detached container",
+	ArgsUsage: `<container-id>
+
+Where "<container-id>" is the name for the instance of the container.
+
+EXAMPLE:
+For example, if the container id is "ubuntu01" and runc list currently shows the
+status of "ubuntu01" as "stopped" the following will delete resources held for
+"ubuntu01" removing "ubuntu01" from the runc list of containers:
+
+       # runc delete ubuntu01`,
+	Flags: []cli.Flag{
+		cli.BoolFlag{
+			Name:  "force, f",
+			Usage: "Forcibly deletes the container if it is still running (uses SIGKILL)",
+		},
+	},
+	Action: func(context *cli.Context) error {
+		if err := checkArgs(context, 1, exactArgs); err != nil {
+			return err
+		}
+
+		id := context.Args().First()
+		container, err := getContainer(context)
+		if err != nil {
+			if lerr, ok := err.(libcontainer.Error); ok && lerr.Code() == libcontainer.ContainerNotExists {
+				// if there was an aborted start or something of the sort then the container's directory could exist but
+				// libcontainer does not see it because the state.json file inside that directory was never created.
+				path := filepath.Join(context.GlobalString("root"), id)
+				if e := os.RemoveAll(path); e != nil {
+					fmt.Fprintf(os.Stderr, "remove %s: %v\n", path, e)
+				}
+			}
+			return err
+		}
+		s, err := container.Status()
+		if err != nil {
+			return err
+		}
+		switch s {
+		case libcontainer.Stopped:
+			destroy(container)
+		case libcontainer.Created:
+			return killContainer(container)
+		default:
+			if context.Bool("force") {
+				return killContainer(container)
+			} else {
+				return fmt.Errorf("cannot delete container %s that is not stopped: %s\n", id, s)
+			}
+		}
+
+		return nil
+	},
+}