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##### SUMMARY
<!--- Explain the problem briefly below -->
The [docker_container](https://docs.ansible.com/ansible/latest/modules/docker_container_module.html) module recreates a container when the `restart_policy` is changed. This can be changed using the `docker update` command.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
[docker_container](https://docs.ansible.com/ansible/latest/modules/docker_container_module.html)

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```shell
$ ansible --version
ansible 2.9.2
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/ingmar/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 3.7.5 (default, Oct 17 2019, 12:09:47) [GCC 9.2.1 20190827 (Red Hat 9.2.1-1)]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below
$ ansible-config dump --only-changed
<empty>
```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
```shell
$ lsb_release -a
LSB Version:    :core-4.1-amd64:core-4.1-noarch
Distributor ID: Fedora
Description:    Fedora release 30 (Thirty)
Release:        30
Codename:       Thirty
```

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
1. Run the following playbook:
```sh
$ ansible-playbook docker-container-update.yml
```
<!--- Paste example playbooks or commands between quotes below -->
```yaml
- name: Container update restart_policy
  hosts: localhost
  tasks:
    - name: Container with restart_policy
      docker_container:
        name: restart_policy_example
        image: alpine
        state: present
        restart_policy: unless-stopped
        entrypoint: top
```
2. Change the `restart_policy` to `always` and run it again.
```sh
$ ansible-playbook docker-container-update.yml
```
<!--- Paste example playbooks or commands between quotes below -->
```yaml
- name: Container update restart_policy
  hosts: localhost
  tasks:
    - name: Container with restart_policy
      docker_container:
        name: restart_policy_example
        image: alpine
        state: present
        restart_policy: unless-stopped
        entrypoint: top
```
3. Notice by using the `docker ps` command that the container is recreated instead of updated.

##### EXPECTED RESULTS
I expect the container to be update with  the new `restart_policy` by using the docker update command:
```sh
$ docker update --restart=<new policy>
``` 

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
The container is recreated instead of updated.
I currently run a `command` task before the container which updates the command.
```yml
# Update docker restart policy
- name: Update docker container restart policy
  command: "docker update --restart={{ (restart_policy == false) | ternary('no', restart_policy) }} {{ container }}"
  ignore_errors: true
```
else:
                diff = False
                network_info_ipam = network_info.get('IPAMConfig') or {}
                if network.get('ipv4_address') and network['ipv4_address'] != network_info_ipam.get('IPv4Address'):
                    diff = True
                if network.get('ipv6_address') and network['ipv6_address'] != network_info_ipam.get('IPv6Address'):
                    diff = True
                if network.get('aliases'):
                    if not compare_generic(network['aliases'], network_info.get('Aliases'), 'allow_more_present', 'set'):
                        diff = True
                if network.get('links'):
                    expected_links = []
                    for link, alias in network['links']:
                        expected_links.append("%s:%s" % (link, alias))
                    if not compare_generic(expected_links, network_info.get('Links'), 'allow_more_present', 'set'):
                        diff = True
                if diff:
                    different = True
                    differences.append(dict(
                        parameter=network,
                        container=dict(
                            name=network['name'],
                            ipv4_address=network_info_ipam.get('IPv4Address'),
                            ipv6_address=network_info_ipam.get('IPv6Address'),
                            aliases=network_info.get('Aliases'),
                            links=network_info.get('Links')
                        )
                    ))
        return different, differences
    def has_extra_networks(self):