Fix neutron upgrade using host limit without controllers

When running kolla-ansible upgrade with a host limit that does not
include controllers, the neutron upgrade fails.

Change-Id: I7125a6ef1f180db6997026ff27e84feb04ee239d
Closes-Bug: #1939691
(cherry picked from commit 72e0673)

Author: priteau

ansible/roles/neutron/tasks/rolling_upgrade.yml

@@ -56,8 +56,8 @@
     common_options: "{{ docker_common_options }}"
     name: "{{ neutron_server.container_name }}"
   when:
-    - is_stop_neutron_server|length > 0
     - neutron_server.host_in_groups | bool
+    - is_stop_neutron_server|length > 0
   notify:
     - "Restart neutron-server container"