DAOS-18641 tests: test pool_extend.py with debug log

[liuxuezhao]

Test-tag: NvmePoolExtend
Test-repeat: 8
Skip-nlt: true
Skip-unit-test-memcheck: true
Skip-unit-tests: true
Skip-unit-test: true
Skip-checkpatch: true
Skip-fault-injection-test: true
Quick-Functional: true

Steps for the author:

• Commit message follows the guidelines.
• Appropriate Features or Test-tag pragmas were used.
• Appropriate Functional Test Stages were run.
• At least two positive code reviews including at least one code owner from each category referenced in the PR.
• Testing is complete. If necessary, forced-landing label added and a reason added in a comment.

After all prior steps are complete:

• Gatekeeper requested (daos-gatekeeper added as a reviewer).

[github-actions]

Ticket title is 'nvme/pool_extend.py:NvmePoolExtend.test_nvme_pool_extend - IOR failed'
Status is 'In Progress'
Labels: 'ci_master_weekly,scrubbed_2.8,test_2.8,weekly_test'
https://daosio.atlassian.net/browse/DAOS-18641

[daosbuild3]

Test stage Functional Hardware Large MD on SSD completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-17674/1/execution/node/739/log

[daosbuild3]

Test stage Functional Hardware Large MD on SSD completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-17674/2/execution/node/739/log

[daosbuild3]

Test stage Functional Hardware Large MD on SSD completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-17674/3/execution/node/739/log