[LightDM] Version 0.9.8 released

[Robert Ancell]

Overview of changes in lightdm 0.9.8

    * GetSeatForCookie and GetSessionForCookie are now deprecated.  They
      remain for now but use the XDG_SEAT_PATH and XDG_SESSION_PATH
      environment variables instead.
    * Change log filenames to be unique across different display types.
    * Fix up script hooks, add regression tests for them
    * Complete removal of X code from the core of LightDM, so it can better
      support various display types
    * Add ability to set the language of a user from the greeter
    * Set LANG variable based on the user language
    * Add language selector into GTK greeter (disabled by default)
    * Allow TCP/IP connections if xserver-allow-tcp is true
    * Allow lightdm --version to be run as non-root
    * Automatically respond to PAM messages without prompts
    * Create 'AddLocalXSeat' D-Bus method, and require root to use 'AddSeat'
    * Fix multi-seat configuration picking the same display number
    * Use correct D-Bus and power interface in liblightdm-qt
    * Run pam_setcred inside the session process so pam_group works
    * Make sure one session is always selected in the GTK greeter