Reuse TimingMeasurementsFlag constants in favor of duplicated strings.
Reuse TimingMeasurementsFlag constants in favor of duplicated strings.

syed/PerfKitBenchmarker,gablg1/PerfKitBenchmarker,kivio/PerfKitBenchmarker,ehankland/PerfKitBenchmarker,ehankland/PerfKitBenchmarker,ksasi/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,AdamIsrael/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,meteorfox/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,askdaddy/PerfKitBenchmarker,AdamIsrael/PerfKitBenchmarker,juju-solutions/PerfKitBenchmarker,msurovcak/PerfKitBenchmarker,ksasi/PerfKitBenchmarker,gablg1/PerfKitBenchmarker,emaeliena/PerfKitBenchmarker,mateusz-blaszkowski/PerfKitBenchmarker,kivio/PerfKitBenchmarker,lleszczu/PerfKitBenchmarker,emaeliena/PerfKitBenchmarker,tvansteenburgh/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,mateusz-blaszkowski/PerfKitBenchmarker,meteorfox/PerfKitBenchmarker,juju-solutions/PerfKitBenchmarker,tvansteenburgh/PerfKitBenchmarker,msurovcak/PerfKitBenchmarker,syed/PerfKitBenchmarker,askdaddy/PerfKitBenchmarker,lleszczu/PerfKitBenchmarker