reftable/stack: stop using `sleep_millisec()`

Refactor our use of `sleep_millisec()` by open-coding it with poll(3p),
which is the current implementation of this function. Ideally, we'd use
a more direct way to sleep, but there is no equivalent to sleep(3p) that
would accept milliseconds as input.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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