DAOS-18425 rebuild: NAK certain rebuild stop commands

[kccain]

When a dmg pool rebuild stop (or system rebuild stop) command is run, the PS leader should refuse to stop a currently-running rebuild if there are more scheduled rebuilds for the pool in the rg_queue_list. In this case, -DER_NO_PERM is returned to the dmg command.

Also, for usability of the feature, the handling of the stop command will return errors when:

• there is no currently-running rebuild (-DER_NONEXIST)
• the rebuild has effectively finsihed, and is simply cleaning up (i.e., it is in op:Reclaim now) (-DER_BUSY)

Features: rebuild

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 'interactive rebuild: "dmg system rebuild stop" not working in case of rank reintegration'
Status is 'In Progress'
Labels: 'Rebuild,test_2.8'
https://daosio.atlassian.net/browse/DAOS-18425

[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/job/PR-17421/1/display/redirect

[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-17421/1/execution/node/1276/log

[daosbuild3]

Test stage Functional Hardware Medium Verbs Provider MD on SSD completed with status UNSTABLE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net/job/daos-stack/job/daos//view/change-requests/job/PR-17421/1/testReport/

[daosbuild3]

Test stage Functional Hardware Medium Verbs Provider MD on SSD completed with status UNSTABLE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net/job/daos-stack/job/daos//view/change-requests/job/PR-17421/2/testReport/

[daosbuild3]

Test stage Functional Hardware Medium MD on SSD completed with status UNSTABLE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net/job/daos-stack/job/daos//view/change-requests/job/PR-17421/2/testReport/

[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-17421/2/execution/node/492/log