Switch ping benchmark to use sample.Sample
Switch ping benchmark to use sample.Sample

# *** ERROR: *** Unit test failure.
# Your commit will be aborted unless you fix these.
#   COMMIT_BLOCKED_ON_UNIT_TESTS

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