DAOS-16550 test: use correct stonewall file with mdtest

[daltonbohning]

Use a dynamic stonewall file with mdtest instead of hardcoded path.

Skip-unit-tests: true
Skip-fault-injection-test: true

Required-githooks: true

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[github-actions]

Ticket title is 'ftest: use correct stonewall file for mdtest'
Status is 'In Progress'
https://daosio.atlassian.net/browse/DAOS-16550

[daltonbohning]

Modified tests passed: https://build.hpdd.intel.com/job/daos-stack/job/daos/job/PR-15109/1/testReport/
And the status file is set as excpected
https://build.hpdd.intel.com/job/daos-stack/job/daos/job/PR-15109/1/artifact/Functional%20Hardware%20Medium/performance/mdtest_easy.py/job.log

2024-09-10 08:00:36,009 parameters       L0143 DEBUG| PARAMS (key=stonewall_statusfile, path=/run/mdtest_pil4dfs_s1/*, default=None) => 'stoneWallingStatusFile'
2024-09-10 08:00:36,009 command_utils_ba L0339 DEBUG|   Added the directory: stonewall_statusfile => /var/tmp/daos_testing/stoneWallingStatusFile