DAOS-17693 control: Preserve metadata device label

[kjacque]

In MD on SSD mode, if a device is being used for the metadata, preserve the original device label (if any) during format.

Features: control

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 'dmg storage format command destroys control_metadata device partition label' Status is 'In Review' Labels: 'HPE,md_on_ssd,scrubbed_2.8' https://daosio.atlassian.net/browse/DAOS-17693

[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-17279/1/testReport/

[daosbuild3]

Test stage Functional Hardware Medium 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-17279/1/execution/node/1399/log

[kjacque]

Test run completed with unrelated failures:

• Functional test timeout: https://daosio.atlassian.net/browse/DAOS-18353
• Known NLT issues: https://daosio.atlassian.net/browse/DAOS-17795, https://daosio.atlassian.net/browse/DAOS-17416