This will display lines like:

2019-06-12 16:26:57 - (cubicweb.pyramid.bwcompat) INFO: REQUEST [view] '/wiki/334037' selected controller <cubicweb.web.views.basecontrollers.ViewController object at 0x7f133802ae90> at /root/.virtualenvs/abreton/local/lib/python2.7/site-packages/cubicweb/web/views/basecontrollers.py:120

2019-06-12 16:26:59 - (cubicweb.pyramid.bwcompat) INFO: REQUEST [data] '/data/ea5eb3b6f89fba0ff4b671093c88d3dd/images/cartouche-mur.jpg' selected controller <cubicweb.web.views.staticcontrollers.DataController object at 0x7f1332a84d50> at /root/.virtualenvs/abreton/local/lib/python2.7/site-packages/cubicweb/web/views/staticcontrollers.py:179

The make debugging easier as this isn't done already. Most other web frameworks
do something similar for the developper to be able to understand what is
happening right now.

Closes #17219741