iostat column width display

Hello all,

the column widths in iostat(1) output are not spaced correctly.

      tty             ad0              da0              cd0             cpu
 tin tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
  14  170  0.00   0  0.00  128.00 202 25.23   0.00   0  0.00   2  0 10  6 82
  15  324  0.00   0  0.00  128.00 202 25.23   0.00   0  0.00   2  0  0  5 94

KB/t > 100 make the display overflow. KB/t is not helpful anyway,
because '1.00' is of width 4, whereas '1024' (bytes) would be of width 4
too. So either cut it down to '1.0' or just use the byte count anyway.

Proposed patch is attached. It simply changes the display to %5.1f, an
alternative would be to remove the additional spaces between different
devices.

Ulrich Spoerlein

PS: This still sucks, as transfer rates above 100MB/s will make the
display overflow again :(
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