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
done in3.15.0
load2.000
load left0.000
closed by<not specified>