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
dagbag_mock.return_value = dagbag
        self.security_manager._sync_dag_view_permissions = mock.Mock()
        for dag in dags:
            dag_resource_name = permissions.resource_name_for_dag(dag.dag_id)
            all_perms = self.security_manager.get_all_permissions()
            assert ('can_read', dag_resource_name) not in all_perms
            assert ('can_edit', dag_resource_name) not in all_perms
        self.security_manager.create_dag_specific_permissions()
        dagbag_mock.assert_called_once_with(read_dags_from_db=True)
        collect_dags_from_db_mock.assert_called_once_with()
        for dag in dags:
            dag_resource_name = permissions.resource_name_for_dag(dag.dag_id)
            all_perms = self.security_manager.get_all_permissions()
            assert ('can_read', dag_resource_name) in all_perms
            assert ('can_edit', dag_resource_name) in all_perms
        self.security_manager._sync_dag_view_permissions.assert_called_once_with(
            permissions.resource_name_for_dag('has_access_control'), access_control
        )
        del dagbag.dags["has_access_control"]
        with assert_queries_count(1):  
            self.security_manager.create_dag_specific_permissions()
    def test_get_all_permissions(self):
        with assert_queries_count(1):
            perms = self.security_manager.get_all_permissions()
        assert isinstance(perms, set)
        for perm in perms:
            assert isinstance(perm, tuple)
            assert len(perm) == 2
        assert ('can_read', 'Connections') in perms
    def test_get_all_non_dag_permissions(self):