Reverts letsencrypt/boulder#5963 Turns out the tests are still flaky -- using the `grpc.WaitForReady(true)` connection option results in sometimes seeing 9 entries added to the purger queue, and sometimes 10 entries. Reverting because flakiness on main should not be tolerated.  | 
			||
|---|---|---|
| .. | ||
| networktype | ||
| bdp_estimator.go | ||
| controlbuf.go | ||
| defaults.go | ||
| flowcontrol.go | ||
| handler_server.go | ||
| http2_client.go | ||
| http2_server.go | ||
| http_util.go | ||
| proxy.go | ||
| transport.go | ||