cubicweb #2164487 inter-instances communication bus via zmq [validation pending]

Use cases:

  1. BFSS files propagation (eg apycot/web instances of the same application)
  2. apycot test propagation (eg information propagation between instances of different applications such as logilab.org and cubicweb.org)
prioritynormal
typeenhancement
appeared in<not specified>
done in3.15.0
load2.000
load left0.000
closed by<not specified>