DAOS-17796 test: rebuild/basic.py:RbldBasic.test_simple_rebuild pool …

[dinghwah]

To remove system_ram_reserved: 1 from rebuild/basic.yaml

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[bot]]

Ticket title is 'rebuild/basic.py:RbldBasic.test_simple_rebuild pool create failed: DER_BUSY(-1012) Leap15.6' Status is 'Reopened' https://daosio.atlassian.net/browse/DAOS-17796

[daosbuild3]

Test stage NLT on EL 8.8 completed with status UNSTABLE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net/job/daos-stack/job/daos//view/change-requests/job/PR-17236/1/testReport/