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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
```
container_ports = parse_port_range(container_port, self.client)
            p_len = len(parts)
            if p_len == 1:
                port_binds = len(container_ports) * [(default_ip,)]
            elif p_len == 2:
                port_binds = [(default_ip, port) for port in parse_port_range(parts[0], self.client)]
            elif p_len == 3:
                
                ipaddr = parts[0]
                if not re.match(r'^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$', parts[0]) and not re.match(r'^\[[0-9a-fA-F:]+\]$', ipaddr):
                    self.fail(('Bind addresses for published ports must be IPv4 or IPv6 addresses, not hostnames. '
                               'Use the dig lookup to resolve hostnames. (Found hostname: {0})').format(ipaddr))
                if re.match(r'^\[[0-9a-fA-F:]+\]$', ipaddr):
                    ipaddr = ipaddr[1:-1]
                if parts[1]:
                    port_binds = [(ipaddr, port) for port in parse_port_range(parts[1], self.client)]
                else:
                    port_binds = len(container_ports) * [(ipaddr,)]
            for bind, container_port in zip(port_binds, container_ports):
                idx = '{0}/{1}'.format(container_port, protocol) if protocol else container_port
                if idx in binds:
                    old_bind = binds[idx]
                    if isinstance(old_bind, list):
                        old_bind.append(bind)
                    else:
                        binds[idx] = [old_bind, bind]
                else:
                    binds[idx] = bind
        return binds
    def _get_volume_binds(self, volumes):