exchange: extract ccxt init to its own function (so that we can init ccxt from the scripts)

freqtrade/misc.py

@@ -71,6 +71,8 @@ def file_dump_json(filename, data, is_zip=False) -> None:
     :param data: JSON Data to save
     :return:
     """
+    print(f'dumping json to "{filename}"')
+
     if is_zip:
         if not filename.endswith('.gz'):
             filename = filename + '.gz'