Get a list of Resource Pools

    .. code-block:: bash

        salt-cloud -f pool_list myxen

def pool_list(call=None):
    '''
    Get a list of Resource Pools

    .. code-block:: bash

        salt-cloud -f pool_list myxen

    '''
    if call == 'action':
        raise SaltCloudSystemExit(
            'This function must be called with -f, --function argument.'
        )
    ret = {}
    session = _get_session()
    pools = session.xenapi.pool.get_all()
    for pool in pools:
        pool_record = session.xenapi.pool.get_record(pool)
        ret[pool_record['name_label']] = pool_record
    return ret