This change adds the first of many tests for the gem5stats. The current test only considers a setup consisiting of traffic generator, cache and memory. Change-Id: I3ebe16131aed5bf6dad68de673f9491f1bea1c78 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/55743 Maintainer: Bobby Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>