Upgrade CentOS from 6.5 to 7

• will be somewhat tricky since we have to use network installs

• CentOS upgrade tool failed to properly update a diskless node

• CentOS pre upgrade tool assessment failed on computenode02 due to the paritioning scheme

• successful in-place upgrade seems unlikely

• using PXE and kickstart worked on computenode02

• details will be placed in the wiki