bus: align the buffer we pass to the kernel
bus: test - re-enable check for returned error
bus: rename KDBUS_CMD_FNAME_POLICY_NONE -> KDBUS_CMD_FNAME_POLICY_OPEN
dbus: fill in kdbus sender+destination from kdbus data
bus: add kdbus test for name registry
bus: don't calculate kmsg message too large
kdbus: make sure msg structure is properly initialized
kdbus: update kdbus.h from upstream
kdbus: use a valid service name for testing