##### 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.
try:
            member = group.members.get(user_id)
        except gitlab.exceptions.GitlabGetError as e:
            return None
        return member
    '''
    @param group Group object
    @param user_id Id of the user to check
    '''
    def memberExists(self, group, user_id):
        member = self.findMember(group, user_id)
        return member is not None
    '''
    @param group Group object
    @param user_id Id of the user to check
    @param access_level GitLab access_level to check
    '''
    def memberAsGoodAccessLevel(self, group, user_id, access_level):
        member = self.findMember(group, user_id)
        return member.access_level == access_level
    '''
    @param user User object
    @param group_path Complete path of the Group including parent group path. <parent_path>/<group_path>
    @param access_level GitLab access_level to assign
    '''
    def assignUserToGroup(self, user, group_identifier, access_level):