iotests: ensure we print nbd server log on error
If we abort the iotest early the server.log file might contain useful information for diagnosing the problem. Ensure its contents are displayed in this case. Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com> Message-Id: <20190220145819.30969-2-berrange@redhat.com> [eblake: fix shell quoting] Signed-off-by: NEric Blake <eblake@redhat.com>
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