Fix flake8 issues cubicweb/server/sources/native.py:505: [E501] line too long (101 > 100 characters) cubicweb/pyramid/__init__.py:31: [E501] line too long (104 > 100 characters)

etc/init.d
etc/cubicweb.d
usr/bin
var/log/cubicweb
var/lib/cubicweb/backup
var/lib/cubicweb/instances