DAOS-11724 test: pool/svc.py - Update the number of ranks to stop

[shimizukko]

In pool/svc.py, we stop 0, 1, or 2 ranks based on the expected number of PS replicas. However, there's a limit for the number of ranks we can stop, which are:

Number of PS replicas - Number of ranks we can stop 1 - 0 3 - 1 5 - 2

We were stopping 2 ranks when the number of PS replicas was 3. Update the test so that we only stop 1 rank; and stop 2 ranks only when the number of PS replicas is 5.

Skip-unit-tests: true Skip-fault-injection-test: true Test-tag: test_pool_svc Required-githooks: true Signed-off-by: Makito Kano [email protected]

[github-actions[bot]]

Bug-tracker data: Ticket title is 'pool/svc.py: Error destroying pool TestLabel_1: DAOS I/O Engine instance not started or not responding on dRPC' Status is 'Open' Labels: 'triaged' https://daosio.atlassian.net/browse/DAOS-11724