test: fix conversion of microseconds in test
Fixes: https://github.com/nodejs/node/issues/8728
Changes the conversion for process cpuUsage test
Checklist
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commit message follows commit guidelines
Affected core subsystem(s)
process
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fixes: https://github.com/nodejs/node/issues/8728
Changes the conversion for process cpuUsage test
process