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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

description: json parsed response from the server
  returned: always
  type: dict
error:
  description: the error message returned by the GitLab API
  returned: failed
  type: str
  sample: "400: path is already in use"
runner:
  description: API object
  returned: always
  type: dict
'''
import traceback
GITLAB_IMP_ERR = None
try:
    import gitlab
    HAS_GITLAB_PACKAGE = True
except Exception:
    GITLAB_IMP_ERR = traceback.format_exc()
    HAS_GITLAB_PACKAGE = False
from ansible.module_utils.api import basic_auth_argument_spec
from ansible.module_utils.basic import AnsibleModule, missing_required_lib
from ansible.module_utils._text import to_native
try:
    cmp
except NameError:
    def cmp(a, b):
        return (a > b) - (a < b)
class GitLabRunner(object):