analysis/appengine: use a 60s timeout when fetching query results
analysis/appengine: use a 60s timeout when fetching query results

Change-Id: Id4d36e9da9839d85d37947b09303ec57121b6fb1
Reviewed-on: https://go-review.googlesource.com/35873
Reviewed-by: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

golang/perf,golang/perf