Updated openstack/openstack
Project: openstack/python-heatclient  42099da4b3fc0d824897eaa0a16f86209db2beb9
null
normalise_file_path_to_url: use urlutils.pathname2url

Directly using urllib.pathname2url prevents this part of the code from working
with Python 3.

Change-Id: I9c0d295c321c1a16ef797efa856118fbd42ca950