Re: [rhel6-branch][master] fix zipl boot loader upgrades

[Chris Lumens <clumens redhat com>]

> Strange bug, but legitimate.  I don't think this use case ever got much
> testing because the code has been this way for a while.  The patch fixes
> reading existing zipl configuration data so that boot loader changes
> work during upgrade...and the reIPL device is set.
> 
> Tested on rhel6-branch, but suitable for master since the code is the
> same for this stuff right now.  Sure am looking forward to a booty
> overhaul.

Looks okay.

- Chris