don't call reexec.Init from chrootarchive

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)

Conflicts:
	daemon/graphdriver/aufs/aufs_test.go
		fixed conflict caused by imports

daemon/graphdriver/aufs/aufs_test.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/docker/docker/daemon/graphdriver"
 	"github.com/docker/docker/pkg/archive"
+	"github.com/docker/docker/pkg/reexec"
 )
 
 var (
@@ -18,6 +19,10 @@ var (
 	tmp      = path.Join(tmpOuter, "aufs")
 )
 
+func init() {
+	reexec.Init()
+}
+
 func testInit(dir string, t *testing.T) graphdriver.Driver {
 	d, err := Init(dir, nil)
 	if err != nil {

daemon/graphdriver/vfs/vfs_test.go

@@ -1,10 +1,17 @@
 package vfs
 
 import (
-	"github.com/docker/docker/daemon/graphdriver/graphtest"
 	"testing"
+
+	"github.com/docker/docker/daemon/graphdriver/graphtest"
+
+	"github.com/docker/docker/pkg/reexec"
 )
 
+func init() {
+	reexec.Init()
+}
+
 // This avoids creating a new driver for each test if all tests are run
 // Make sure to put new tests between TestVfsSetup and TestVfsTeardown
 func TestVfsSetup(t *testing.T) {

graph/pools_test.go

@@ -1,6 +1,14 @@
 package graph
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/docker/docker/pkg/reexec"
+)
+
+func init() {
+	reexec.Init()
+}
 
 func TestPools(t *testing.T) {
 	s := &TagStore{

pkg/chrootarchive/archive_test.go

@@ -7,8 +7,13 @@ import (
 	"testing"
 
 	"github.com/docker/docker/pkg/archive"
+	"github.com/docker/docker/pkg/reexec"
 )
 
+func init() {
+	reexec.Init()
+}
+
 func TestChrootTarUntar(t *testing.T) {
 	tmpdir, err := ioutil.TempDir("", "docker-TestChrootTarUntar")
 	if err != nil {

pkg/chrootarchive/init.go

@@ -10,7 +10,6 @@ import (
 func init() {
 	reexec.Register("docker-untar", untar)
 	reexec.Register("docker-applyLayer", applyLayer)
-	reexec.Init()
 }
 
 func fatal(err error) {