tests: use tar --no-same-owner for sysfs dump extraction

tests: use tar --no-same-owner for sysfs dump extraction

Use --no-same-owner when extracting sysfs dump tarballs so that
extracted files are owned by the current user rather than preserving
the original (often root) ownership from the archive.

This allows chmem tests to run without root since they only operate
on a local sysfs dump via --sysroot. The valid_zones file (0444 in
real sysfs) needs an explicit chmod u+w before the test can write
to it. Apply --no-same-owner to lsblk, lscpu, lsmem, and hardlink
tests for consistency.

Signed-off-by: Karel Zak <kzak@redhat.com>