Remove the remote repository-access-through-zmq support
Modern methods such as the rqlcontroller cube + the cwclientlib library are the way forward.
Closes #2919297.
usr/lib/PY_VERSION/*-packages/cubicweb/server/
usr/lib/PY_VERSION/*-packages/cubicweb/hooks/
usr/lib/PY_VERSION/*-packages/cubicweb/sobjects/
usr/lib/PY_VERSION/*-packages/cubicweb/schemas/
usr/share/cubicweb/migration/