Fix a bug in recent btrfs patch when an extended partition is examined.
    
      (H.J. Lu) (bug #906847)
    - Fix naming of /boot partitions according to their fstab entry (bug #893472)
    - Don't generate .btrfsfix files which will be included in final rpm
    - Fix wrong boot partition set by linux-boot-prober when / and /boot are
      mounted (bug #906886)
    - Factor out 'logger', so that it is run once and logs are piped to it (John
      Reiser) (bug #875356)