[ratelimits] can't trigger rate-limit

[Vernon Schryver]

> From: Irwin Tillman <irwin at princeton.edu>

> OK, that did the trick; rate-limit triggers now.

thanks for the good news.

> (It seems that the rrl test in ./bin/tests/system/ still reports failure).

I bet that if you ran the test several times, it would pass or fail
in different places.  The test just assumes that by trying to send
a burst of requests with `dig &` soon after the start of a second,
the server will see them within that second.  If other activity
slows the system, then the test burts will be unexpectedly slow.
I wish something like `dig +time=0.5` were available.


thanks again,
Vernon Schryver    vjs at rhyolite.com