Revert "add bz reference"
    
    This reverts commit 67f3fb36b915a7d1851d484be62cd09b6c308ba1.
    
    Reverting the upgrade to 15.04.1 in f22 so we can finally push a fix for the
    showstopper #1219583 without introducing other changes that might not match the
    applications we ship.