[AzureAD] Add an implementation for Authenticator.authenticator_managed_groups=true

[thomafred]

See this related PR in jupyterhub/jupyterhub-repo.

Added support for external user group management to Azure AD authenticator.

Usage example:

"""sample jupyterhub config file for testing

configures jupyterhub with dummyauthenticator and simplespawner
to enable testing without administrative privileges.
"""

c = get_config()  # noqa
c.Application.log_level = 'DEBUG'

from oauthenticator.azuread import AzureAdOAuthenticator
import os

c.JupyterHub.authenticator_class = AzureAdOAuthenticator

c.AzureAdOAuthenticator.client_id = os.getenv("AAD_CLIENT_ID")
c.AzureAdOAuthenticator.client_secret = os.getenv("AAD_CLIENT_SECRET")
c.AzureAdOAuthenticator.oauth_callback_url = os.getenv("AAD_CALLBACK_URL")
c.AzureAdOAuthenticator.tenant_id = os.getenv("AAD_TENANT_ID")
c.AzureAdOAuthenticator.username_claim = "email"
c.AzureAdOAuthenticator.authorize_url = os.getenv("AAD_AUTHORIZE_URL")
c.AzureAdOAuthenticator.token_url = os.getenv("AAD_TOKEN_URL")
c.Authenticator.authenticator_managed_groups = True
c.Authenticator.refresh_pre_spawn = True

from jupyterhub.spawner import SimpleLocalProcessSpawner

c.JupyterHub.spawner_class = SimpleLocalProcessSpawner

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[thomafred]

Abandoned in favor of this PR: https://github.com/jupyterhub/oauthenticator/pull/573