libct/cgroups/systemd/v1: add NewLegacyManager

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

libcontainer/cgroups/systemd/v1.go

@@ -23,6 +23,13 @@ type LegacyManager struct {
 	Paths   map[string]string
 }
 
+func NewLegacyManager(cg *configs.Cgroup, paths map[string]string) cgroups.Manager {
+	return &LegacyManager{
+		Cgroups: cg,
+		Paths:   paths,
+	}
+}
+
 type subsystem interface {
 	// Name returns the name of the subsystem.
 	Name() string

libcontainer/factory_linux.go

@@ -88,10 +88,7 @@ func SystemdCgroups(l *LinuxFactory) error {
 	}
 
 	l.NewCgroupsManager = func(config *configs.Cgroup, paths map[string]string) cgroups.Manager {
-		return &systemd.LegacyManager{
-			Cgroups: config,
-			Paths:   paths,
-		}
+		return systemd.NewLegacyManager(config, paths)
 	}
 
 	return nil