cubicweb-forge #2896217 test_possible_actions fail on some platforms [validation pending]

due to unpredictible order of self.pactions()

prioritynormal
typebug
done in1.9.2
load0.250
load left0.000
closed by#ddd1e24a6ecd [tests] fix unstable sort problem and kill dead code (closes #2896217)
patch[tests] fix unstable sort problem and kill dead code (closes #2896217) [applied]