[libvirt] [PATCH] Use XDG Base Directories instead of storing in home

Hi, New to the list so hopefully I'm following the correct protocol. Attached is a patch (mostly untested at the moment) to change the default storage location from .libvirt to the locations defined in the XDG Base Directory Specification (http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html). This has a number of advantages for us: It allows sharing a home directory between different machines, or sessions (eg. using NFS) Cleanly separates cache, runtime (eg. sockets), or app data from user settings Supports performing smart or selective migration of settings between different OS versions Supports reseting settings without breaking things Makes it possible to clear cache data to make room when the disk is filling up Allows us to write a robust and efficient backup solution Allows an admin flexibility to change where data and settings are stored It dramatically reduces the complexity and incoherence of the system for administrators This is a pretty important set of features for both enterprise and individual use cases. I hope you will please consider the change. Thanks, Jon PS. This is also related to a goal for upstream GNOME https://live.gnome.org/GnomeGoals/XDGConfigFolders