This can find errors in retry logic. Chaos HTTP Proxy does not
support SSL bouncestorage/chaos-http-proxy#1 so users must set
s3proxy.endpoint and run via:
CHAOS_HTTP_PROXY=1 S3_URL=http://127.0.0.1:8080 make check -C test
It can also be helpful to increase retries and reduce sleep times.
References #1504.
