[CentOS] Do I need these?

Wed Feb 11 20:00:43 UTC 2015
Kahlil Hodgson <kahlil.hodgson at dealmax.com.au>

Probably OK to remove.  The netcf-libs package is a dependency of,
among other things, libvirtd.  Perhaps you installed and removed some
visualization related packages?  If you are keen to remove unwanted
packages, have a look at the 'package-cleanup' command and the
'--leaves' option.

Hope this helps.