DAOS-16001 placement: fix cases for delay_rebuild (#14557)

[jolivier23]

Placement fixes for delayed rebuild

• Note: this is just a partial backport of stuff that changed since we backported it (See DAOS-16001 placement: fix cases for delay_rebuild #14558) before it landed on master branch.

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[github-actions]

Bug-tracker data:
Ticket title is 'data mismatch found for delay_rebuild mode in exclude+reintegrate test'
Status is 'In Progress'
Labels: 'google-cloud-daos,scrubbed_2.8'
https://daosio.atlassian.net/browse/DAOS-16001

[daosbuild1]

LGTM. No errors found by checkpatch.

[cdavis28]

These are just changes to the test cases.
You might want to put that into the commit message.

[cdavis28]

You might want to put that into the commit message.

Oh, "case" here means "test case". Nvm then