http-h2 Envoy benchmarks are broken

[sebastienros]

An unexpected error occurred while building the job: One or more errors occurred. (Command docker build --pull --build-arg SERVER_SCHEME=http --build-arg SERVER_PROTOCOL=http --build-arg DOWNSTREAM_SCHEME=https --build-arg DOWNSTREAM_PROTOCOL=http2  -t benchmarks_envoy-reverseproxy -f docker/envoy/envoy.dockerfile /tmp/benchmarks-agent/benchmarks-server-1/pglk2bny.do0/docker/envoy returned exit code 1)

@MihaZupan