cubicweb #7935030 from __future__ import print_function overflow on cw's scripts [validation pending]

currently one gets a SyntaxError if one of its cubicweb-ctl shell script contains some print without parens. (and this is not easily understandable at once)

prioritynormal
typebug
done in3.22.0
load0.500
load left0.000
closed by#3d948d35d94f [migration] re-try without print_function when compiling a script fails
patch[migration] re-try without print_function when compiling a script fails [applied]