DAOS-16350 test: decrease pool size for ior_per_rank

[jamesanunez]

Test deployment/ior_per_rank fail with 'No space' on some CI clusters. Reduce the requested pool size to accomidate nodes with smaller storage capacity.

Test-tag: test_ior_per_rank
Skip-unit-tests: true
Skip-fault-injection-test: true
Required-githooks: true

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[github-actions]

Ticket title is 'deployment/ior_per_rank.py:IorPerRank.test_ior_per_rank - DER_NOSPACE'
Status is 'In Progress'
Labels: 'ci_master_weekly,scrubbed_2.8,weekly_test,testp2'
https://daosio.atlassian.net/browse/DAOS-16350

[jamesanunez]

This PR only changes the size of the per rank pool for the deployment/ior_per_rank test. Results for this PR running Functional Hardware Medium MD on SSD (the test that was failing) are at https://build.hpdd.intel.com/job/daos-stack/job/daos/job/PR-15183/2/artifact/Functional%20Hardware%20Medium%20MD%20on%20SSD/deployment/ior_per_rank.py/
and the results for Functional Hardware Medium are at https://build.hpdd.intel.com/job/daos-stack/job/daos/job/PR-15183/2/artifact/Functional%20Hardware%20Medium/deployment/ior_per_rank.py/ .

For this PR to land, do we need to any additional testing or is this testing sufficient to land?
Thanks.

[daltonbohning]

This PR only changes the size of the per rank pool for the deployment/ior_per_rank test. Results for this PR running Functional Hardware Medium MD on SSD (the test that was failing) are at https://build.hpdd.intel.com/job/daos-stack/job/daos/job/PR-15183/2/artifact/Functional%20Hardware%20Medium%20MD%20on%20SSD/deployment/ior_per_rank.py/ and the results for Functional Hardware Medium are at https://build.hpdd.intel.com/job/daos-stack/job/daos/job/PR-15183/2/artifact/Functional%20Hardware%20Medium/deployment/ior_per_rank.py/ .

For this PR to land, do we need to any additional testing or is this testing sufficient to land? Thanks.

Since you only modified this one test, it's sufficient to just run this test.