Fixed DiagnosticsSettingsExpectedValuesReturned, now we only accept string value for trace level setting.
Fixed DiagnosticsSettingsExpectedValuesReturned, now we only accept string value for trace level setting.

projectkudu/kudu,shibayan/kudu,EricSten-MSFT/kudu,sitereactor/kudu,EricSten-MSFT/kudu,puneet-gupta/kudu,puneet-gupta/kudu,sitereactor/kudu,shibayan/kudu,puneet-gupta/kudu,projectkudu/kudu,projectkudu/kudu,EricSten-MSFT/kudu,sitereactor/kudu,juvchan/kudu,projectkudu/kudu,juvchan/kudu,shibayan/kudu,sitereactor/kudu,shibayan/kudu,juvchan/kudu,juvchan/kudu,puneet-gupta/kudu,juvchan/kudu,puneet-gupta/kudu,projectkudu/kudu,sitereactor/kudu,EricSten-MSFT/kudu,shibayan/kudu,EricSten-MSFT/kudu