sweet: don't sleep until cockroachdb cluster workload is ready

Currently there's a time.Sleep to wait until the cluster workload is
ready for the CockroachDB benchmark, but I suspect this is flaky. Run
the benchmarking tool with a really small duration instead to try and
identify whether the cluster is ready.

Change-Id: Ie79c930442e0a7d8c5b1d9951974472f50178fd9
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/615418
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
1 file changed