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bpo-35772: Fix test_tarfile on ppc64 (GH-11606)

Authored by Victor Stinner <vstinner@redhat.com> on Jan 21 2019, 2:24 AM.

Description

bpo-35772: Fix test_tarfile on ppc64 (GH-11606)

Fix sparse file tests of test_tarfile on ppc64le with the tmpfs
filesystem.

Fix the function testing if the filesystem supports sparse files:
create a file which contains data and "holes", instead of creating a
file which contains no data.

tmpfs effective block size is a page size (tmpfs lives in the page
cache). RHEL uses 64 KiB pages on aarch64, ppc64 and ppc64le, only
s390x and x86_64 use 4 KiB pages, whereas the test punch holes of
4 KiB.

test.pythoninfo: Add resource.getpagesize().

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