zdtm: update static/utsname test due to ns isolation changes
zdtm: update static/utsname test due to ns isolation changes

v2: fixed returning zero (errno) value in case of sys_write() didn't fail.

Signed-off-by: Stanislav Kinsbursky <43b28e187c4fe6e53d7ab0bb71957481e322f182@parallels.com>
Signed-off-by: Andrey Vagin <74c05afa918858348d6db8037d82fa8124870113@gmail.com>

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