anaconda poor error handling

[Chris Lumens]

> Just tried (and failed) update f15->f16.  Using dvd (most reliable method).
> 
> Went fine until I hit an error, trying to update ipython.  At this point, 
> anaconda just quit.  No hints given what the issue was.  No offer to try to 
> report the error.
> 
> It mentioned that it _might_ be caused by a problem reading the media.  Switch 
> consoles, I saw no hint of an I/O error.  My guess is it might have been a cpio 
> error because I had a newer ipython installed via easy_install.
> 
> After trying various strategies to rescue, I gave up and did clean install.

/tmp/anaconda.log, /tmp/syslog, and /mnt/sysimage/root/upgrade.log would
all be helpful things to see right now.

- Chris