devshell.bbclass: set a default for XAUTHORITY and export DBUS_SESSION_BUS_ADDRESS.
devshell.bbclass: set a default for XAUTHORITY and export DBUS_SESSION_BUS_ADDRESS.

Signed-off-by: Chris Larson <8cf06b7089d5169434d5def8b2d1c9c9c95f6e71@mvista.com>

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