`receive: header: EOF` triggered by LXD

[cole-miller]

@tomponline pointed out this error from LXD CI logs:

https://jenkins.linuxcontainers.org/job/lxd-github-pull-test/8038/arch=arm64,backend=dir,compiler=golang-tip,section=cluster/console#console-section-0

Let's see if we can figure out what if anything is going wrong in dqlite here.