sweet: remove etcd benchmark output spew

This causes the upstream log to be truncated, and it looks like
benchmark results are now missing for some benchmarks on some commits.

Change-Id: I29f434870a21d4ccdd0dad7d8825e5bb0fc4dbdc
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/493920
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
1 file changed