zdtm.py: grep errors even if criu exists with 0
Signed-off-by:Andrew Vagin <avagin@openvz.org> Signed-off-by:
Pavel Emelyanov <xemul@parallels.com>
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Signed-off-by:Andrew Vagin <avagin@openvz.org> Signed-off-by:
Pavel Emelyanov <xemul@parallels.com>