[ldapfeed] re-enable ldap tests for python 3.7 This was disabled because ldap3<2 wasn't compatible with python 3.7 While I'm here, drop unseless newline.

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