##### 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.
group = findGroup(self._gitlab, group_identifier)
        if self._module.check_mode:
            return True
        if group is None:
            return False
        if self.memberExists(group, self.getUserId(user)):
            member = self.findMember(group, self.getUserId(user))
            if not self.memberAsGoodAccessLevel(group, member.id, self.ACCESS_LEVEL[access_level]):
                member.access_level = self.ACCESS_LEVEL[access_level]
                member.save()
                return True
        else:
            try:
                group.members.create({
                    'user_id': self.getUserId(user),
                    'access_level': self.ACCESS_LEVEL[access_level]})
            except gitlab.exceptions.GitlabCreateError as e:
                self._module.fail_json(msg="Failed to assign user to group: %s" % to_native(e))
            return True
        return False
    '''
    @param user User object
    @param arguments User attributes
    '''
    def updateUser(self, user, arguments):