Comment 1 for bug 1844368

I guess this comes from python config parser https://docs.python.org/3.6/library/configparser.html#configparser.ConfigParser.get

So there's a possible workaround in placing double %%, like "fallocate_reserve = 1%%", or pass "raw=true" to config parser.

I'm a bit worried, that changing behaviour might influence negatively on working environments.