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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
```
type: bool
  pid_mode:
    description:
      - Set the PID namespace mode for the container.
      - Note that Docker SDK for Python < 2.0 only supports C(host). Newer versions of the
        Docker SDK for Python (docker) allow all values supported by the Docker daemon.
    type: str
  pids_limit:
    description:
      - Set PIDs limit for the container. It accepts an integer value.
      - Set C(-1) for unlimited PIDs.
    type: int
    version_added: "2.8"
  privileged:
    description:
      - Give extended privileges to the container.
      - If I(container_default_behavior) is set to C(compatiblity) (the default value), this
        option has a default of C(no).
    type: bool
  published_ports:
    description:
      - List of ports to publish from the container to the host.
      - "Use docker CLI syntax: C(8000), C(9000:8000), or C(0.0.0.0:9000:8000), where 8000 is a
        container port, 9000 is a host port, and 0.0.0.0 is a host interface."
      - Port ranges can be used for source and destination ports. If two ranges with
        different lengths are specified, the shorter range will be used.
      - "Bind addresses must be either IPv4 or IPv6 addresses. Hostnames are *not* allowed. This
        is different from the C(docker) command line utility. Use the L(dig lookup,../lookup/dig.html)
        to resolve hostnames."
      - A value of C(all) will publish all exposed container ports to random host ports, ignoring