qemu: hotplug: Clear vcpu ordering for coldplug of vcpus

Vcpu order is required to stay sequential. Clear the order on cpu
coldplug to avoid issues with removing vcpus out of sequence.

(cherry picked from commit b416a33a)

src/qemu/qemu_hotplug.c

@@ -5784,13 +5784,15 @@ qemuDomainSetVcpuConfig(virDomainDefPtr def,
 
     def->individualvcpus = true;
 
+    /* ordering information may become invalid, thus clear it */
+    virDomainDefVcpuOrderClear(def);
+
     while ((next = virBitmapNextSetBit(map, next)) >= 0) {
         if (!(vcpu = virDomainDefGetVcpu(def, next)))
             continue;
 
         vcpu->online = state;
         vcpu->hotpluggable = VIR_TRISTATE_BOOL_YES;
-        vcpu->order = 0;
     }
 }