Setup python path /after/ we've done updates
    
    If we try to setup the python path before /tmp/updates/ exists, the path
    will get thrown out and won't be used even if that path will get created
    at some point later.  So just re-order things.
    
    This is ugly, and shouls only live for the F18 Alpha.  After that we
    should be using /run/install/updates directly and thus the path can be
    set there early.