[cwctl] allow overriding config settings from the command line (closes #5557656)
eg.
cubicweb-ctl start -p port:8082 myapp
to overload the port parameter defined in the all-in-one.conf file.
# -*- coding: utf-8 -*-
# copyright %(year)s %(author)s, all rights reserved.
# contact %(author-web-site)s -- mailto:%(author-email)s
#
%(long-license)s
"""%(distname)s specific hooks and operations"""