Reduce number of file handles on csv file #92
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The number of file handles created by the Random CSV Data Set Config causes problems when using it on Cloud infrastructure, in Azure for example, file shares have a limit of 2000 file handles per file so when running high volume tests with more than 2000 threads it causes a 'Disk Quota Exceeded' exception. This change reduces the number of file handles created on the csv file which means more threads can share the same csv data file.