netcat.test: reduce flake.

Starting two netcats at the same time and expecting them to be able to
talk to each is a little optimistic. I don't know whether `sleep .1`
will be sufficient, but wanted to try that before going to `sleep 1`
since neither the toybox nor the github nor the Android infrastructure
is running these tests in parallel, those seconds add up.

Right now this has a ~20% flake rate on the Android infrastructure. I
was able to reproduce the flake locally with `while true ; do make
test_netcat ; done` on my desktop before this patch, but not after.
(Though my desktop is way overpowered for just running that, whereas the
build servers tend to be pretty busy, which is why I reserve the right
to return later with a longer delay.)

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