cpuflags: Don't swap the clone to vm in cpuflags test

This swap is not necessary and makes it less clear whether we act on vm
or clone. Let's be more explicit and rely on "cleanup" to shutdown both.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

qemu/tests/cpuflags.py

@@ -856,15 +856,10 @@ def run(test, params, env):
                 self.vm.monitor.migrate_set_downtime(1)
                 self.vm.wait_for_migration(mig_timeout)
 
-            # Swap due to test cleaning.
-            temp = self.vm.clone(copy_state=True)
-            self.vm.__dict__ = self.clone.__dict__
-            self.clone = temp
-
-            self.vm.resume()
-            self.clone.destroy(gracefully=False)
+            self.clone.resume()
+            self.vm.destroy(gracefully=False)
 
-            stress_session = self.vm.wait_for_login()
+            stress_session = self.clone.wait_for_login()
 
             # If cpuflags-test hang up during migration test raise exception
             try: