Do not make centcore start on boot when doing an update

[tanguyvda]

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BUG REPORT INFORMATION

Centreon Web version: 2.8.x

Centreon Engine version: 1.8.x

Centreon Broker version: 3.0.X

OS: centos 6

Additional environment details (AWS, VirtualBox, physical, etc.):
Virtual

Steps to reproduce the issue:

1. chkconfig centcore off
2. yum update
3. chkconfig --list centcore

Describe the results you received:
centcore is now enabled on boot

Describe the results you expected:
I don't want centcore to be on boot. It is disabled because we use pacemaker to handle that resource.

Additional information you think important (e.g. issue happens only occasionally):