[Toybox] Cat tests

[Elie De Brauwer]

Hi all,

I found out that I had a failure on the cat tests, this because diff 
uses /proc/self/exe which only works if diff is part of toybox which it 
is not, so I changed this failing test to make use of cmp and while 
doing that I implemented some of the other tests which were in that test 
script as 'future work'.

gr
E.

-- 
Elie De Brauwer

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