Fix kube-burner 1.15.0 compatibility issues in per-host-density that were introduced in PR #23:

• Move vmiLatency/pvcLatency measurements from create-vms job back to global: section — kube-burner 1.15.0 does not support per-job measurements and fails with field measurements not found in type config.rawJob
• Remove customStatusPaths from create-source-dv job which fails with Error extracting or find status in object DataVolume on kube-burner 1.15.0
• Add waitWhenFinished: true and podWait: true to create-source-dv job so kube-burner waits for the CDI importer pod to complete

Upstream PR: https://github.com/redhat-vmeperf/cnv-scenarios/pull/29