Remove duplicate step
Add new step for editing /etc/fstab

This new step discusses how to properly edit the /etc/fstab file to
ensure new data drives are mounted automatically after a reboot.  In
addition it discusses the use of UUIDs to refer to drives rather than
just the device name (/dev/sdc1).  If one has multiple data drives this
is required, as using just the device names may result in
inconsistencies if the VM is moved or rebooted.