vendor: remove unuse vendor package github.com/imdario/mergo

Signed-off-by: Michael Wan <zirenwan@gmail.com>

daemon/mgr/container_upgrade.go

@@ -105,14 +105,14 @@ func (mgr *ContainerManager) Upgrade(ctx context.Context, name string, config *t
 }
 
 func (mgr *ContainerManager) prepareContainerEntrypointForUpgrade(ctx context.Context, c *Container, config *types.ContainerUpgradeConfig) error {
-	// first, use the entrypoint specified by ContainerUpgradeConfig
+	// Firstly, try to use the entrypoint specified by ContainerUpgradeConfig
 	if len(config.Entrypoint) > 0 {
 		return nil
 	}
 
-	// secondly, use the entrypoint of the old container
+	// Secondly, try to use the entrypoint of the old container.
 	// because of the entrypoints of old container's CreateConfig and old image being merged,
-	// we cannot decide the old container's entrypoint belongs which, so just check if the old
+	// so we cannot decide which config that the old container's entrypoint belongs to, so just check if the old
 	// container's entrypoint is different with the old image.
 	c.Lock()
 	defer c.Unlock()
@@ -121,6 +121,9 @@ func (mgr *ContainerManager) prepareContainerEntrypointForUpgrade(ctx context.Co
 	if err != nil {
 		return err
 	}
+
+	// if the entrypoints of old container and the old image is empty, we should use to CMD of old container,
+	// else if entrypoints are different, we use the CMD of old container.
 	if (c.Config.Entrypoint == nil && oldImgConfig.Entrypoint == nil) || !utils.StringSliceEqual(c.Config.Entrypoint, oldImgConfig.Entrypoint) {
 		config.Entrypoint = c.Config.Entrypoint
 		if len(config.Cmd) == 0 {
@@ -130,7 +133,7 @@ func (mgr *ContainerManager) prepareContainerEntrypointForUpgrade(ctx context.Co
 		return nil
 	}
 
-	// thirdly, use the entrypoint of the new image
+	// Thirdly, just use the entrypoint of the new image
 	newImgConfig, err := mgr.ImageMgr.GetOCIImageConfig(ctx, config.Image)
 	if err != nil {
 		return err