This is a known issue:
I would recommend filing a bug with Red Hat to have them fix it.
I am going to see if I can find someone in the organization with a Red Hat account to open the bug. In the meantime, I came up with a workaround. I wanted to see if I could role the updates back to CentOS 6.7 since the system was 6.7 until I applied the updates. The alternative is to load the system from scratch, so what is there to loose. The result seems to be working so I will document what I did.
# First I rebooted and specified to use the original kernel
# Then mount the place where I unloaded the original DVD ISOs mount -t nfs phxbkup2:/iso/centos6.7x64 /media/CentOS
# Tried to sync from this location, but it did not work, yum --disablerepo=* --enablerepo=c6-media --releasever=6.7 distribution-synchronization # There were a number of conflicts that prevented the yum to run.
# The troublesome packages did not look like they would prevent booting, so I got rid of them yum --disablerepo=* --enablerepo=c6-media --releasever=6.7 erase python-libipa_hbac-1.13.3-22.el6_8.4.x86_64 mesa-libxatracker-11.0.7-4.el6.x86_64 xorg-x11-drivers-7.3-13.4.el6.x86_64 mesa-libxatracker-11.0.7-4.el6.x86_64 yum --disablerepo=* --enablerepo=c6-media --releasever=6.7 erase xcb-util xcb-util-renderutil
# Tried the distro sync again and it went through. yum --disablerepo=* --enablerepo=c6-media --releasever=6.7 distribution-synchronization
# Tried to put back the problem packages, especially since one contained the driver I needed. The drivers went in. # The xcb-util xcb-util-renderutil got reinstalled as part of the distro sync yum --disablerepo=* --enablerepo=c6-media --releasever=6.7 install xorg-x11-drivers
# The other packages were not part of the media, so they got left out. yum --disablerepo=* --enablerepo=c6-media --releasever=6.7 install python-libipa_hbac mesa-libxatracker mesa-libxatracker
# Finally, I disabled the CentOS-Base repos and enabled the CentOS-Vault 6.7 repos (Same3 as from the Base) and ran "yum update" to get to the latest set from 6.7. The xorg and x11dirvers were not updated. Rebooted and I have a desktop.
This is not the first time distribution-synchronization has pulled my butt out of the fire.
Thank you for the suggestions which eventually helped me narrow down the problem.