BLD: replacing symbols.json and fetching markets with a single config

tests/exchange/test_config.py

@@ -0,0 +1,8 @@
+from catalyst.exchange.utils.factory import get_exchange
+
+
+class TestConfig:
+    def test_create_config(self):
+        exchange = get_exchange('binance', skip_init=True)
+        config = exchange.create_exchange_config()
+        pass