[Toybox] vmstat spring clean

[Elie De Brauwer]

All,

You can find in attachment an enhancement of the vmstat code (with 
respect to what's upstream). This includes:
- spaces/tabs cleanup (mea culpa)
- toybuf buffer issues (using xread iso fdlength, and add zero byte at 
the end (nice catch btw) )
- query the terminal height and update this.

W.r.t. this last one, i only perform the query after printing a header 
so not every loop so there is some transition from going to extremely 
large to extremely small terminal heights. But vmstat isn't doing a 
great job at handling that either. I also think that if this call fails 
on serial consoles, perhaps it makes sense to have teh ascii probing 
implemented in the library itself?

my 2 cents
E.
-- 
Elie De Brauwer

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