Replace Ansible Docker Swarm's "restart_policy" flag with "restart_config"

[anandhakumarpalanisamy]

Replace Ansible Docker Swarm's "restart_policy" flag with "restart_config"

• In newer versions of ansible, the restart_policy flag is replaced with "restart_config"

Reference : https://docs.ansible.com/ansible/2.9/modules/docker_swarm_service_module.html