[CentOS] From Networkmanager to self managed configuration files

Certain application doesn't like the NetworkManager

for example take a look here.


https://www.rdoproject.org/install/quickstart/


And on server stage it's better to run without 
any complicate configuration tools.

Tools can make life harder in some cases.

Got many other distros run before centos, why not.

I personally like it slim and easy. 


Sincerely

Andy