moves python2 release to component/jupyter-py2 because it is required by ERP5 but not maintained anymore

moves to python 3 :

• test/test.py
• jupyter_notebook_config.py.jinja
• ERP5kernel.py

modifies custom.js to create a workaround for events issue

upgrades slapos.cookbook version to 1.0.171 to use zero_knowledge recipe with python 3

adds jupyter partition check in software/erp5/test/test_erp5.py