patch to make appliance-creator compress qcow2 images
    
    This patch makes appliance-creator use compression when writing qcow2
    images. I decided to make it just always do that rather than adding a flag
    because
    
     1) this way it should just work with koji without needing any changes to
        how appliance-creator is called
     2) if you want uncompressed there's still raw
    
    This makes a 211MB F19 cloud image. :)
    
    --
    Matthew Miller           mattdm@mattdm.org          <http://mattdm.org/>
    
    From 1e9bb9437c7dc433a2fc99e941e2358ffc0d52e8 Mon Sep 17 00:00:00 2001
    From: Matthew Miller <mattdm@mattdm.org>
    Date: Mon, 20 May 2013 19:27:11 -0400
    Subject: [PATCH] always compress when qcow2 format is used. (use raw for
     uncompressed images)