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

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 {

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) {