iotests: Test media change with iothreads

iotests case 118 already tests all relevant operations for media change
with multiple devices, however never with iothreads. This changes the
test so that the virtio-scsi tests run with an iothread.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20231013153302.39234-3-kwolf@redhat.com>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/118

@@ -277,7 +277,8 @@ class TestInitiallyFilled(GeneralChangeTestsBaseClass):
                                    'file.driver=file',
                                    'file.filename=%s' % old_img ])
         if self.interface == 'scsi':
-            self.vm.add_device('virtio-scsi-pci')
+            self.vm.add_object('iothread,id=iothread0')
+            self.vm.add_device('virtio-scsi-pci,iothread=iothread0')
         self.vm.add_device('%s,drive=drive0,id=%s' %
                            (interface_to_device_name(self.interface),
                             self.device_name))
@@ -312,7 +313,8 @@ class TestInitiallyEmpty(GeneralChangeTestsBaseClass):
         if self.use_drive:
             self.vm.add_drive(None, 'media=%s' % self.media, 'none')
         if self.interface == 'scsi':
-            self.vm.add_device('virtio-scsi-pci')
+            self.vm.add_object('iothread,id=iothread0')
+            self.vm.add_device('virtio-scsi-pci,iothread=iothread0')
         self.vm.add_device('%s,%sid=%s' %
                            (interface_to_device_name(self.interface),
                             'drive=drive0,' if self.use_drive else '',