lsns: enhance the way to debug lsns::ioctl_ns test case #2979
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When the test case runs successfully, we expect the case test prints nothing to stderr. If something is printed to stderr, it helps us debug lsns command and the test case. Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Masatake YAMATO <yamato@redhat.com>
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See #2967.
On the stable branch, we have rarely observed the lsns::ioctl_ns test case.
The changes in this pull request make the case print more information when it fails, which will be useful for future debugging of the case and lsns command.