cubicweb-queueing #3289770 Use sys.executable instead of hard-coded "python" [validation pending]

prioritynormal
typebug
done in0.3.1
load0.100
load left0.000
closed by#a786113903dd [entities] Use sys.executable instead of hardcoding python, #daa9e46ddf2a [entities] Use sys.executable instead of hardcoding python
patch[entities] Use sys.executable instead of hardcoding python [applied]