[CentOS] Update to 1503 release problem

Hi there,
Yesterday I've updated from 7 to 7.1 and today I've noticed on 2 server 
that postgresql systemd file was replaced with default values. This make 
postgres to no start and webserver give me problem. This problem was 
fixed and now all works good. It's normal that on major update I can get 
this problem? If so, I've ridden release change but I have not ridden 
about postgresql problem.

Someone had the same issue?