{upload,receive}-pack tests: add --advertise-refs tests
The --advertise-refs option had no explicit tests of its own, only
other http tests that would fail at a distance if it it was
broken. Let's test its behavior explicitly.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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