[pkg] Stop using /etc/bash_completion.d
cubicweb-ctl shipped an empty /etc/bash_completion.d as a leftover
of shipping a bash completion script. As pointed by Lintian, this
directory is not obsolete, so let's get rid of it for good.
Document: cubicweb-doc
Title: CubicWeb Documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/python3-cubicweb-documentation/html/index.html
Files: /usr/share/doc/python3-cubicweb-documentation/html/*