##### 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.
from __future__ import absolute_import, division, print_function
__metaclass__ = type
ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}
DOCUMENTATION = '''
---
module: gitlab_user
short_description: Creates/updates/deletes GitLab Users
description:
  - When the user does not exist in GitLab, it will be created.
  - When the user does exists and state=absent, the user will be deleted.
  - When changes are made to user, the user will be updated.
version_added: "2.1"
author:
  - Werner Dijkerman (@dj-wasabi)
  - Guillaume Martinez (@Lunik)
requirements:
  - python >= 2.7
  - python-gitlab python module
  - administrator rights on the GitLab server
extends_documentation_fragment:
    - auth_basic
options:
  server_url:
    description: