qemu-iotests/118: Avoid blockdev-add with id

We want to remove the 'id' option for blockdev-add. This removes one
user of the option and makes it use only node names.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

tests/qemu-iotests/118

@@ -648,13 +648,9 @@ class TestBlockJobsAfterCycle(ChangeBaseClass):
         qemu_img('create', '-f', iotests.imgfmt, old_img, '1M')
 
         self.vm = iotests.VM()
+        self.vm.add_drive_raw("id=drive0,driver=null-co,if=none")
         self.vm.launch()
 
-        result = self.vm.qmp('blockdev-add',
-                             options={'id': 'drive0',
-                                      'driver': 'null-co'})
-        self.assert_qmp(result, 'return', {})
-
         result = self.vm.qmp('query-block')
         self.assert_qmp(result, 'return[0]/inserted/image/format', 'null-co')