pyramid-cubicweb #14159555 Python 3 compatibility [validation pending]

Prior to merging this project into cubicweb, we'll have to make it python3 compatible

prioritynormal
typetask
done in0.8.0
load1.000
load left0.000
closed by#1400aee10df4 Port to Python3 (closes #14159555)
patchPort to Python3 (closes #14159555) [applied]