fix the issue of disassociating sandbox

When do sandbox release action, it will stop the sandbox
monitor, once received this monitor stop notification,
it shouldn't do the pod clean action.

Signed-off-by: fupan <[email protected]>

Author: lifupan

daemon/pod/decommission.go

@@ -535,10 +535,14 @@ func (p *XPod) waitVMStop() {
 	if err != nil {
 		p.Log(INFO, "cannot monitor the vm, %v", err)
 	} else {
-		_ = <-monitor
-		p.Log(INFO, "got vm exit event")
+		ret, ok := <-monitor
+		/*get the sandbox released notification, thus it doesn't need to do cleanup*/
+                if ! ok {
+                        p.Log(INFO, "got vm disassociate event")
+                        return
+                }
+		p.Log(INFO, "got vm exit event: %v", ret)
 	}
-
 	p.cleanup()
 }