[CentOS] CentOS 7.5 (1804) and NetworkManager

Gnome's control-center now requires NetworkManager-wifi. But it's only a 
soft requirement, no shared libs involved.

To keep your workstation NM-free, you want to install a dummy package 
that provides NetworkManager-wifi but actually contains nothing, ideally 
before updating to 7.5. Here's a script to create such a dummy: 
https://github.com/larsks/fakeprovide

If you do this, control-center shows a sad face and some text (Oops, 
blah, blah, ...) in the WiFi tab. Just the same you always got in the 
network tab without NM. That's all.

-M.