qemu: Properly detect crash of a rebooted domain

When a domain is rebooted using libvirt API, we use fake reboot
consisting of shutting down and resetting the domain. Thus we see a
SHUTDOWN event and set gotShutdown flag. But we never reset it back and
if the domain crashes after it was rebooted this way, we consider it was
a normal shutdown and not a crash.

src/qemu/qemu_process.c

@@ -405,6 +405,7 @@ qemuProcessFakeReboot(void *opaque)
                             "%s", _("resume operation failed"));
         goto endjob;
     }
+    priv->gotShutdown = false;
     event = virDomainEventNewFromObj(vm,
                                      VIR_DOMAIN_EVENT_RESUMED,
                                      VIR_DOMAIN_EVENT_RESUMED_UNPAUSED);