algo: acelan: add json log

Add json log file and read the buy_count and sell_count from the log
if $config["init_buy_sell_count"] is not set.

Signed-off-by: AceLan Kao <acelan@acelan.idv.tw>
algo: acelan: adjust sell amount

Orginally, we will adjust the sell amount when buy_count larger or equal to 1.
In this case, buy one time and sell one time won't sell out enough amount of
coins, and we'll pile too much coin on hand.
So, change the rule a little to sell the same portion as we just bought when
buy_count equal to 1.

Signed-off-by: AceLan Kao <acelan@acelan.idv.tw>