Write job information to cache

def cache_jobs(opts, jid, ret):
    '''
    Write job information to cache
    '''
    serial = salt.payload.Serial(opts=opts)

    fn_ = os.path.join(
        opts['cachedir'],
        'minion_jobs',
        jid,
        'return.p')
    jdir = os.path.dirname(fn_)
    if not os.path.isdir(jdir):
        os.makedirs(jdir)
    with salt.utils.files.fopen(fn_, 'w+b') as fp_:
        fp_.write(serial.dumps(ret))