cubicweb #2801737 tests shouldn't depend on a pyro ns [done]

that makes them more fragile than necessary

prioritynormal
typeenhancement
done in3.16.2
load0.500
load left0.000
closed by#522bdba66690 [server/test] remove dependency on a pyro name server (closes #2801737)
patch[server/test] remove dependency on a pyro name server (closes #2801737) [applied]