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##### SUMMARY
<!--- Explain the problem briefly below -->

`python-gitlab` library release a new version [v1.13.0](https://github.com/python-gitlab/python-gitlab/releases/tag/v1.13.0). User/Password authentication as been removed completely causing all Ansible GitLab module to fail... 

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->

gitlab_group
gitlab_deploy_key
gitlab_hook
gitlab_project
gitlab_project_variable
gitlab_runner
gitlab_user

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
All versions

changed = False
        
        if self.userObject is None:
            user = self.createUser({
                'name': options['name'],
                'username': username,
                'password': options['password'],
                'email': options['email'],
                'skip_confirmation': not options['confirm'],
                'admin': options['isadmin'],
                'external': options['external']})
            changed = True
        else:
            changed, user = self.updateUser(self.userObject, {
                'name': options['name'],
                'email': options['email'],
                'is_admin': options['isadmin'],
                'external': options['external']})
        
        if options['sshkey_name'] and options['sshkey_file']:
            key_changed = self.addSshKeyToUser(user, {
                'name': options['sshkey_name'],
                'file': options['sshkey_file']})
            changed = changed or key_changed
        
        if options['group_path']:
            group_changed = self.assignUserToGroup(user, options['group_path'], options['access_level'])
            changed = changed or group_changed