Returns the returner modules

def returners(opts, functions, whitelist=None, context=None, proxy=None):
    '''
    Returns the returner modules
    '''
    return LazyLoader(
        _module_dirs(opts, 'returners', 'returner'),
        opts,
        tag='returner',
        whitelist=whitelist,
        pack={'__salt__': functions, '__context__': context, '__proxy__': proxy or {}},
    )