[LU-16459] Fix test case sanity/test_205d

Related — Wed, 19 Jul 2023 02:49:13 +0000

sanity/test_205d is the test case for ~~LU-16110~~. It may fail silently for 2 reasons:

yaml.safe_load_all() does not report error unless its content is used again (e.g. print the content)
use "output=$()" to capture the output of a command. But it converts newline to space, so that valid YAML is converted to invalid. But the error cannot be found due to the reason above

And in a multi-mds system, put the testdir on mds1 forcefully

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