bug#38411: HTTP pipelining of narinfo requests broken for https://ci.guix.gnu.org

["Ludovic Courtès" <ludo@gnu.org>]

> The weird thing is that we haven’t change the config of berlin in recent
> days.  Berlin runs nginx 1.17.5 on openssl 1.1.1d, while bayfront runs
> nginx 1.17.0 on openssl 1.0.2p.

A new data point: nginx 1.17.4 from a month ago works fine:

--8<---------------cut here---------------start------------->8---
root@berlin ~/maintenance/hydra# guix system list-generations 2m                                                    
[…]
Generation 238  Oct 23 2019 18:02:22
  file name: /var/guix/profiles/system-238-link
  canonical file name: /gnu/store/28xk8ny9qslyqgi7pjyz4d2x0xrxpw07-system
  label: GNU with Linux-Libre 5.3.7
  bootloader: grub
  root device: label: "my-root"
  kernel: /gnu/store/qpasq1pkzb47w5pjzs80pvslv1n7ja1m-linux-libre-5.3.7/bzImage
[…]
root@berlin ~/maintenance/hydra# guix gc -R /gnu/store/28xk8ny9qslyqgi7pjyz4d2x0xrxpw07-system|grep nginx
/gnu/store/4gbpgcr4zc4qf59yq2a008maycfwra4n-shepherd-nginx.scm
/gnu/store/3gqi5cahcwjfvv0bbfqv8ifir2vrqirh-nginx.conf
/gnu/store/s9fm4d5ii8bnh9zv5k78mzjvcl3dipbh-shepherd-nginx.go
/gnu/store/zj3mxk3r2dka56favm357kmgywnv5imk-nginx-1.17.4
root@berlin ~/maintenance/hydra# guix gc --references /gnu/store/zj3mxk3r2dka56favm357kmgywnv5imk-nginx-1.17.4/sbin/nginx |grep ssl
/gnu/store/1dvkm6b97667qd36rsnw4g6isnsmpym7-openssl-1.1.1d
--8<---------------cut here---------------end--------------->8---

So for now berlin is running this nginx.  I’ll try with 1.17.6 and
1.17.4 on top of current master.

Ludo’.