##### SUMMARY
The gitlab_user module does not set sshkey when the user is newly created or has been changed already. This is due to the `changed = changed or ...` construct on line 237 in branch devel.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
`lib/ansible/modules/source_control/gitlab_user.py`

##### ANSIBLE VERSION
```
ansible 2.8.1
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/user/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/user/.virtualenvs/ans3.6/lib/python3.6/site-packages/ansible
  executable location = /home/user/.virtualenvs/ans3.6/bin/ansible
  python version = 3.6.7 (default, Oct 22 2018, 11:32:17) [GCC 8.2.0]
```

##### CONFIGURATION
N/A

##### OS / ENVIRONMENT
N/A

##### STEPS TO REPRODUCE
Create a new gitlab user and set sshkey:
```
- name: Create gitlab user
  gitlab_user:
    server_url: "{{ gitlab_url }}"
    api_token: "{{ gitlab_token }}"
    name: test user
    username: test_user
    password: "{{ user_password }}"
    email: "{{ user_email }}"
    sshkey_name: test_user
    sshkey_file: "{{ key_content }}"
    state: present

# Note that the sshkey for test_user is not actually set now

# Run the same module again to set the sskey

- name: Actually set sshkey for gitlab user
  gitlab_user:
    server_url: "{{ gitlab_url }}"
    api_token: "{{ gitlab_token }}"
    name: test user
    username: test_user
    password: "{{ user_password }}"
    email: "{{ user_email }}"
    sshkey_name: test_user
    sshkey_file: "{{ key_content }}"
    state: present
```

##### EXPECTED RESULTS
Only having to run the module once should set all the fields correctly.

##### ACTUAL RESULTS
Running the module once does not set sshkey, if the user was not yet there or changed.
sshkey_name=dict(type='str'),
        sshkey_file=dict(type='str'),
        group=dict(type='str'),
        access_level=dict(type='str', default="guest", choices=["developer", "guest", "maintainer", "master", "owner", "reporter"]),
        confirm=dict(type='bool', default=True),
        isadmin=dict(type='bool', default=False),
        external=dict(type='bool', default=False),
    ))
    module = AnsibleModule(
        argument_spec=argument_spec,
        mutually_exclusive=[
            ['api_url', 'server_url'],
            ['api_username', 'login_user'],
            ['api_password', 'login_password'],
            ['api_username', 'api_token'],
            ['api_password', 'api_token'],
            ['login_user', 'login_token'],
            ['login_password', 'login_token']
        ],
        required_together=[
            ['api_username', 'api_password'],
            ['login_user', 'login_password'],
        ],
        required_one_of=[
            ['api_username', 'api_token', 'login_user', 'login_token'],
            ['server_url', 'api_url']
        ],
        supports_check_mode=True,
    )
    deprecation_warning(module)