tripleo_helper: various fixes
tripleo_helper: various fixes

- correctly upload the stack details
- set the correct final status
- avoid a 'cat' call when we can just use the new open() method

Change-Id: Ie67245de87943b64ac5cc39a7025c7186772fe4a

redhat-cip/python-dciclient,redhat-cip/python-dciclient