Revert "Revert "use no_timer_check boot option -- see https://bugzilla.redhat.com/show_bug.cgi?id=1102592#c5""
    
    Yesterday was not a good day for doing things without double-checking. I
    reverted this on the wrong branch. It *should* be here on this one. So, I'm
    re-reverting. Awesome.
    
    This reverts commit c90a8409a4f79b8bda932c3ba823a6b74385300c.