sandbox cleanup

[Eric S. Raymond]

Hal Murray via devel <devel at ntpsec.org>:
> I don't plan to commit any small changes like that.  That module needs 
> serious work, not minor tweaks.  Besides, I should be working on the DNS 
> stuff.

Agreed.  I'll get on cleaning up the sandbox stuff.  I don't understand
the async-DNS stuff as well as you do, so that's a better place for you
to put effort.
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