Without this `synchronize` runs `rsync`
to sync from `localhost` to itself.
[servers]
-vbox9 ansible_host=localhost debian_distr=stretch debian_mirror=http://mirror.yandex.ru/debian
-vbox10 ansible_host=localhost debian_distr=buster debian_mirror=https://mirror.yandex.ru/debian
-
-[all:vars]
-ansible_port=2022
+vbox9 ansible_host=localhost ansible_port=2022 debian_distr=stretch debian_mirror=http://mirror.yandex.ru/debian
+vbox10 ansible_host=localhost ansible_port=2022 debian_distr=buster debian_mirror=https://mirror.yandex.ru/debian