Fix kolla-ansible not reflect environment changed

Neutron's containers should use ENV from kolla_docker module's
environment parameter (defined in roles/neutron/defaults/main.yml)
after reconfigure, not only when deploying.

Currently this is working only for deploy, not for reconfigure.

How to test it ?
- Deploy neutron with "neutron_legacy_iptables" set to yes/no.
- Change value of "neutron_legacy_iptables" to opposite value as before.
- Reconfigure neutron.

Current result :
 - "KOLLA_LEGACY_IPTABLES" in container's ENV is not changed

Expected result :
 - "KOLLA_LEGACY_IPTABLES:" in container's ENV should be changed

This patch is fixing this behaviour by adding missing
environment parameter to neutron's "Check neutron containers" task.

Change-Id: Ibfbe2d4f49261fa766acbb6ff45da9994118bda8
Closes-Bug: #1853776

ansible/roles/neutron/tasks/check-containers.yml

@@ -9,6 +9,7 @@
     privileged: "{{ item.value.privileged | default(False) }}"
     volumes: "{{ item.value.volumes }}"
     dimensions: "{{ item.value.dimensions }}"
+    environment: "{{ item.value.environment | default(omit) }}"
   when:
     - item.value.enabled | bool
     - item.value.host_in_groups | bool