<fix>[vm]: add Destroying->Stopped state transition

When MN restarts during a destroy operation, the hypervisor may report
the VM as Stopped. Without this transition, the state machine throws
an exception and the VM stays stuck in Destroying state forever.

Resolves: ZSTAC-80620

Change-Id: I037edba70d145a44a88ce0d3573089182fedb162

Author: AlanJager

header/src/main/java/org/zstack/header/vm/VmInstanceState.java

@@ -168,6 +168,7 @@ public enum VmInstanceState {
                 new Transaction(VmInstanceStateEvent.destroyed, VmInstanceState.Destroyed),
                 new Transaction(VmInstanceStateEvent.destroying, VmInstanceState.Destroying),
                 new Transaction(VmInstanceStateEvent.running, VmInstanceState.Running),
+                new Transaction(VmInstanceStateEvent.stopped, VmInstanceState.Stopped),
                 new Transaction(VmInstanceStateEvent.expunging, VmInstanceState.Expunging)
         );
         Destroyed.transactions(