ZendAuthenticator.session_container

This enables you to specify the session container name.

// Set the container name
$moxieManagerConfig['ZendAuthenticator.session_container'] = 'mycontainer';

Override the user by setting:

// Override user in using the Zend 2 session container
$this->session = new Zend\Session\Container("mycontainer");
$this->session->user = "username";