UPSTREAM: revert: 6d2d90f: opencontainers/runc: 1683: Fix race against systemd

Origin-commit: 68ceb424d14cc0c84d55dc179ee349e6f6eab1c2

Author: sjenning

libcontainer/cgroups/systemd/apply_systemd.go

@@ -295,13 +295,10 @@ func (m *Manager) Apply(pid int) error {
 		}
 	}
 
-	statusChan := make(chan string)
-	if _, err := theConn.StartTransientUnit(unitName, "replace", properties, statusChan); err != nil && !isUnitExists(err) {
+	if _, err := theConn.StartTransientUnit(unitName, "replace", properties, nil); err != nil && !isUnitExists(err) {
 		return err
 	}
 
-	<-statusChan
-
 	if err := joinCgroups(c, pid); err != nil {
 		return err
 	}