Construct VM hdds from cloud profile config

def _get_hdds(vm_):
    '''
    Construct VM hdds from cloud profile config
    '''
    _hdds = config.get_cloud_config_value(
        'hdds', vm_, __opts__, default=None,
        search_global=False
    )

    hdds = []

    for hdd in _hdds:
        hdds.append(
            Hdd(
                size=hdd['size'],
                is_main=hdd['is_main']
            )
        )

    return hdds