Airflow 2.1.0, Docker

**What happened**:

Users with the Guest role assigned are stuck in a redirect loop once they attempt to login successfully to the web interface.

**What you expected to happen**:

Get minimal access to the dashboard with the appropriate views for a guest role

**How to reproduce it**:
1. Assign a guest role to any user and remove any other roles with the administrator user.
2. Logout from the admin account 
3. Login as the guest user
4. You will notice constant HTTP redirects, and the dashboard will not show up.


tests/www/views/test_views_base.py
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import datetime
import json
import pytest
from airflow import version
from airflow.jobs.base_job import BaseJob
from airflow.utils import timezone
from airflow.utils.session import create_session
from tests.test_utils.asserts import assert_queries_count
from tests.test_utils.config import conf_vars
from tests.test_utils.www import check_content_in_response, check_content_not_in_response
def test_index(admin_client):
    with assert_queries_count(46):
        resp = admin_client.get('/', follow_redirects=True)
    check_content_in_response('DAGs', resp)
def test_doc_urls(admin_client):