Add vendor configuration directory installation

[Valentin Lefebvre]

Hello,


    This patch add a new autoconf argument that allows installation
into the vendor configuration directory (/usr/etc/). Some linux
distribution now move system configuration files from /etc to /usr/etc.
See this ref: [0]. 
    So, it could be a good idea to give the opportunity for a project
to install in both location /etc and /usr/etc in same time. Not just by
overriding the sysconfdir arguments. For example we have two projects
PAM and D-Bus that look both in /etc and /usr/etc.
    As a packager for a Linux distribution, it will save times if we
get this multi choice of configuration directory installation.

This patch was created with a Colleague Jason Sikes. Thanks to him!

[0] https://0pointer.net/blog/projects/stateless.html

-- 
Best regards,
Valentin Lefebvre

Linux Distribution Engineer - packager
Member of System Boot and Init team
SUSE Software Solutions Germany GmbH

56100 Lorient, France

0001-stateless-systems-add-vendor-conf-dir-install.patch
Description: 0001-stateless-systems-add-vendor-conf-dir-install.patch