fix proxy VM name

ansible/playbooks/openstack-vms.yml

@@ -325,7 +325,7 @@
     - name: Create proxy
       tags: teardown
       os_server:
-        name: "{{ os_project }}-proxy"
+        name: "{{ os_project }}-{{ win_project }}-proxy"
         state: "{{ state }}"
         image: "{{ proxy_image }}"
         flavor: 3661211f-673a-4777-8857-fd243d6c407d