Relax unnecessarily strict counter assert (#787)
Relax unnecessarily strict counter assert (#787)

Noticed that some runs are failing due to not receiving the expected amount of counters. 

Example:
https://app.circleci.com/pipelines/github/envoyproxy/nighthawk/3411/workflows/4f3cc2a5-8f41-4cf0-b75c-183c63a1eb8d/jobs/31198

Expected 12, Received 14.  The two unaccounted counters are benchmark.pool_overflow and upstream_rq_pending_overflow which is an acceptable outcome of the test. Therefore relaxing test constraints. 

Signed-off-by: tomjzzhang <249948f647da053b98b1511a795ac5d15e0f52b5@users.noreply.github.com>
envoyproxy/nighthawk,envoyproxy/nighthawk,envoyproxy/nighthawk,envoyproxy/nighthawk