[3.12] gh-126909: Fix running xattr tests on systems with lower limits (GH-126930) #126964
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Modify the extended attribute tests to write fewer and smaller extended
attributes, in order to fit within filesystems with total xattr limit
of 1 KiB (e.g. ext4 with 1 KiB blocks). Previously, the test would
write over 2 KiB, making it fail with ENOSPC on such systems.
(cherry picked from commit 2c0a21c)
Co-authored-by: Michał Górny mgorny@gentoo.org