This test was attempting to connect to a session bus and hanging if it couldn't.
Take a patch from upstream to correctly use a private bus.
[ YOCTO #5696 ]
(From OE-Core rev: 12e30b653899567312a7ec29b6e972c85ba8e25e)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>