Bug#815503: dbus-x11: Several session buses if scripts in Xsession.d use D-Bus

[Ksamak]

Sorry about the noise, just a notive that i just spent a couple hours 
struggling with this
bug, and trying to understand why orca didn't want to run.
I guess some of our users will also run into this, i'll keep track of
that.
Thank you for the patch.
-- 
Ksamak
hypra.fr Team