Don't throw "restartmanager canceled" error for no restart policy container

Don't throw "restartmanager canceled" error for no restart policy container
and add the container id to the warning message if a container has restart policy
and has been canceled.

Signed-off-by: Lei Jitang <leijitang@huawei.com>
(cherry picked from commit 494297baf8f391ce73cdc2e885a335a266261970)

libcontainerd/container_linux.go

@@ -117,7 +117,7 @@ func (ctr *container) handleEvent(e *containerd.Event) error {
 		if st.State == StateExit && ctr.restartManager != nil {
 			restart, wait, err := ctr.restartManager.ShouldRestart(e.Status)
 			if err != nil {
-				logrus.Error(err)
+				logrus.Warnf("container %s %v", ctr.containerID, err)
 			} else if restart {
 				st.State = StateRestart
 				ctr.restarting = true

restartmanager/restartmanager.go

@@ -42,6 +42,9 @@ func (rm *restartManager) SetPolicy(policy container.RestartPolicy) {
 }
 
 func (rm *restartManager) ShouldRestart(exitCode uint32) (bool, chan error, error) {
+	if rm.policy.IsNone() {
+		return false, nil, nil
+	}
 	rm.Lock()
 	unlockOnExit := true
 	defer func() {