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/test_security.py
test_security_manager = MockSecurityManager(appbuilder=self.appbuilder)
        assert len(test_security_manager.VIEWER_VMS) == 1
        assert test_security_manager.VIEWER_VMS == {'Airflow'}
    def test_correct_roles_have_perms_to_read_config(self):
        roles_to_check = self.security_manager.get_all_roles()
        assert len(roles_to_check) >= 5
        for role in roles_to_check:
            if role.name in ["Admin", "Op"]:
                assert self.security_manager.exist_permission_on_roles(
                    permissions.RESOURCE_CONFIG, permissions.ACTION_CAN_READ, [role.id]
                )
            else:
                assert not self.security_manager.exist_permission_on_roles(
                    permissions.RESOURCE_CONFIG, permissions.ACTION_CAN_READ, [role.id]
                ), (
                    f"{role.name} should not have {permissions.ACTION_CAN_READ} "
                    f"on {permissions.RESOURCE_CONFIG}"
                )
    @mock.patch("airflow.www.security.DagBag")
    def test_create_dag_specific_permissions(self, dagbag_mock):
        access_control = {'Public': {permissions.ACTION_CAN_READ}}
        dags = [
            DAG('has_access_control', access_control=access_control),
            DAG('no_access_control'),
        ]
        collect_dags_from_db_mock = mock.Mock()
        dagbag = mock.Mock()
        dagbag.dags = {dag.dag_id: dag for dag in dags}
        dagbag.collect_dags_from_db = collect_dags_from_db_mock