[fedora-arm] Reinstall vs update

[Robert Moskowitz]

Now that I am running F22 on a sata drive, updates are actually less 
painful.  Also on a 6Mb connection compared to the old 768Kb connection. 
So...

Under what testing situations should I grep a new build and test versus 
do a 'yum update'?

The guidance is to report issues based on which build we are running, 
but I am tempted to only do installs with major mailstones.  Of course I 
can always do builds to SD cards for build testing as opposed to just 
running my F22 testing off the sata drive.