check_dig: stick with integer devision (e33ecc8)

[abrist]

It may be good enough, but most timeout values other than those that produce 0 from the division (less than 3) will cause dig to only timeout twice with the patch.  I think the disagreement is philosophical at this point:  I would rather allow the user to control the behavior - if they have a slow server or an intermittent one, they may wish for more retries etc.  So we will stick with floating point division, though this does work just fine as well and escapes having to pull in the math libraries. 

Cheers all.

@willix.  no bitwise thank you, though it is clever :)

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