Right now `jsng 'x=5; print(j.core.config.get_config())'` gives syntax error because we use [eval](https://github.com/threefoldtech/js-ng/blob/d1f01cc21bea12e126a43c024b15aca35ddcd788/jumpscale/entry_points/jsng.py#L32) , changing it to exec will make it work
