benchmarks: Fetch only new orders/db transactions rate from repro collection results

Different latency values such as delivery latency, new order latency, payment latency etc. are part of the repro collection MySQL workload results. Modify fastpath script such that it parses only the new orders per min & DB transactions per min values. Ignore latency values for now. Due to an intermittent DB lock issue that occurs in the loadgen process of repro collection workload, latency values couldn't be fetched during all repeats. Also, new orders/db transactions rate have more significance while doing performance comparisons.

Signed-off-by: Aishwarya Rambhadran aishwarya.rambhadran@arm.com