##### SUMMARY
Unable to use the mount mode :nocopy on volume 

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
docker_container

##### ANSIBLE VERSION
```
ansible 2.8.1
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /var/lib/awx/venv/venv-Ansible-28-python27/lib/python2.7/site-packages/ansible
  executable location = /var/lib/awx/venv/venv-Ansible-28-python27/bin/ansible
  python version = 2.7.5 (default, Jun 20 2019, 20:27:34) [GCC 4.8.5 20150623 (Red Hat 4.8.5-36)]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```
N/A
```

##### OS / ENVIRONMENT
AWX 3.0/docker 1.13/ RHEL7.4


##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->

<!--- Paste example playbooks or commands between quotes below -->
```yaml
- name: start nexus_ihm services
  docker_container:
    name: nexus_ihm
    image: '{{ docker_images.nexus_ihm.image }}:{{ docker_images.nexus_ihm.version }}'
    state: started
    recreate: yes
    log_driver: json-file
    restart_policy: 'unless-stopped'
    hostname: nexus_ihm
    env:
      TZ: Europe/Paris
    volumes:
      - 'nfsdata:/nexus-data:nocopy'
      - 'nfsbackup:/backup'
```
##### EXPECTED RESULTS
Beeing able to access the volume within the container like in :  

```sh
[root@LX01665L ~]# docker run --rm -ti -v nfsdata:/test --name test alpine /bin/sh
/ # ls /test/
config.json  init-stdin   init-stdout
/ # exit
[root@LX01665L ~]# docker run --rm -ti -v nfsdata:/test:nocopy --name test alpine /bin/sh
/ # ls /test/
backup               etc                  kar                  port
blobs                generated-bundles    keystores            restore-from-backup
cache                health-check         lock                 tmp
db                   instances            log                  upgrades
elasticsearch        javaprefs            orient
/ #
```

##### ACTUAL RESULTS
The task crash with (NB, accordingly to the documentation in https://docs.ansible.com/ansible/latest/modules/docker_container_module.html where it's not specified beeing usable ) : 

```
fatal: [lx01665l.tb.uro.equant.com]: FAILED! => {"changed": false, "msg": "Found invalid volumes mode: nocopy"}
```

volumes:
    description:
      - List of volumes to mount within the container.
      - "Use docker CLI-style syntax: C(/host:/container[:mode])"
      - "Mount modes can be a comma-separated list of various modes such as C(ro), C(rw), C(consistent),
        C(delegated), C(cached), C(rprivate), C(private), C(rshared), C(shared), C(rslave), C(slave).
        Note that the docker daemon might not support all modes and combinations of such modes."
      - SELinux hosts can additionally use C(z) or C(Z) to use a shared or
        private label for the volume.
      - "Note that Ansible 2.7 and earlier only supported one mode, which had to be one of C(ro), C(rw),
        C(z), and C(Z)."
    type: list
  volume_driver:
    description:
      - The container volume driver.
    type: str
  volumes_from:
    description:
      - List of container names or Ids to get volumes from.
    type: list
  working_dir:
    description:
      - Path to the working directory.
    type: str
    version_added: "2.4"
extends_documentation_fragment:
  - docker
  - docker.docker_py_1_documentation
author:
  - "Cove Schneider (@cove)"