Remove the remote repository-access-through-zmq support Modern methods such as the rqlcontroller cube + the cwclientlib library are the way forward. Closes #2919297.

etc/init.d
etc/cubicweb.d
etc/bash_completion.d
usr/bin
usr/share/doc/cubicweb-ctl
var/log/cubicweb
var/lib/cubicweb/backup
var/lib/cubicweb/instances