[CentOS] Turning off wifi in CentOS 7

Someone else got the 7 pxe install going, and one thing that's annoying is
that NetworkMangler appears to be regularly trying to fire up the wifi.

On a workstation, in a wired environment. I just want to tell NM to knock
it off....It's Monday, and my searching isn't going too well. Clues for
the poor?

       mark