dbus-unit-test.py: utilize tempfile.TemporaryDirectory()

This ensures the files within it and the directory is cleaned up once
the python script ends. Currently this script does not remove the
temporary directory.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I1e7c629dcbcf1e4341b14b9c550589b69ff12b2e
1 file changed