Fix lustre jobstats on OzSTAR #47
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Lustre jobstats continue to be an issue because the script on OzSTAR does not update values for a particular job if there has been no I/O.
This PR changes the code to query the counter (not the derivative), and then calculate the derivative in the python backend. Additionally, it allows the initial value of zero to be assumed, in order to capture I/O spikes at the start of the job, which may occur before the first data point is reported.