IPC removed, replaced by WS

TaskServer/node_modules/ccxt/js/test/Exchange/test.fetchOHLCV.js

@@ -17,8 +17,6 @@ module.exports = async (exchange, symbol) => {
         'btcalpha', // issue with 404 on a documented endpoint https://travis-ci.org/ccxt/ccxt/builds/643930431#L2213
         'bitmex', // an issue with null values,to be resolved later
         'cex',
-        'okex',
-        'okcoinusd',
         'mandala',
     ]