sweet/cmd/sweet: report log tail on failure
Often benchmark errors are in their own stderr log. Try to extract and
report them from the suite runner.
Change-Id: I70ac31ba73e7df189535787b6dc617133d4596e1
Cq-Include-Trybots: luci.golang.try:x_benchmarks-gotip-linux-amd64-longtest
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/600235
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Austin Clements <austin@google.com>
2 files changed
