How to fix the «Missing required argument $routerList of Magento\Framework\App\RouterList» bug in Magento 2.2

Use the same fix as for the «Object DOMDocument should be created» bug.

It has been fixed in the core:
https://github.com/magento/magento2/commit/ddb6c1c6a8796134e940f0a2b3dd1f32e7f6cdf0