roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/20101195?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/20101195?buildTab=artifacts#/ycsb/E/nodes=3/cpu=32/mvcc-range-keys=global) on master @ [255f60e14a03060b9b2ca81e38f7188c33173a7a](https://github.com/cockroachdb/cockroach/commits/255f60e14a03060b9b2ca81e38f7188c33173a7a):

```
test ycsb/E/nodes=3/cpu=32/mvcc-range-keys=global failed: (test_runner.go:850).func4: invalid number of cpus 32 for IBM [owner=test-eng]
```

Parameters:
- cloud=ibm
- coverageBuild=false
- cpu=32
- runtimeAssertionsBuild=false
- ssd=0
Help

See: [roachtest README](https://github.com/cockroachdb/cockroach/blob/master/pkg/cmd/roachtest/README.md)

See: [How To Investigate \(internal\)](https://cockroachlabs.atlassian.net/l/c/SSSBr8c7)

/cc @cockroachdb/test-eng

[This test on roachdash](https://roachdash.crdb.dev/?filter=status:open%20t:.*cluster_creation.*&sort=title+created&display=lastcommented+project) | [Improve this report!](https://github.com/cockroachdb/cockroach/tree/master/pkg/cmd/bazci/githubpost/issues)

Jira issue: CRDB-52175

Start with the TeamCity log and artifacts linked in the report, then read the roachtest README and the failure at test_runner.go:850. Reproduce the ycsb/E cluster_creation run with cloud=ibm and cpu=32, and trace why that CPU value is rejected. Done means the IBM roachtest configuration no longer reports an invalid CPU count and the run completes successfully.

Written by the indexing model from the issue text.