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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

type: list
      sample: "['ACCESS_KEY_ID', 'SECRET_ACCESS_KEY']"
    untouched:
      description: A list of variables which exist.
      returned: always
      type: list
      sample: "['ACCESS_KEY_ID', 'SECRET_ACCESS_KEY']"
    removed:
      description: A list of variables which were deleted.
      returned: always
      type: list
      sample: "['ACCESS_KEY_ID', 'SECRET_ACCESS_KEY']"
    updated:
      description: A list of variables whose values were changed.
      returned: always
      type: list
      sample: "['ACCESS_KEY_ID', 'SECRET_ACCESS_KEY']"
'''
import traceback
from ansible.module_utils.basic import AnsibleModule, missing_required_lib
from ansible.module_utils._text import to_native
from ansible.module_utils.api import basic_auth_argument_spec
GITLAB_IMP_ERR = None
try:
    import gitlab
    HAS_GITLAB_PACKAGE = True
except Exception:
    GITLAB_IMP_ERR = traceback.format_exc()
    HAS_GITLAB_PACKAGE = False
class GitlabProjectVariables(object):