[CentOS] Update to 7.4 using DVD

I continued to play to get this running. I am close.
When X comes up and I click on the user to login - It appears X restarts.

I do see a message that gdm was killed by SIGTRAP in the logs.
I may just have something not installed at this point. I had to "yum
remove" a couple things to allow the update to take place.
One was the libgpod (thanks).

Jerry