Deploy Plan confirmation UX improvements

[Liz Blanchard]

Description
===========
The Deploy Confirmation Modal title should read “Deploy plan name”. The buttons should read “Deploy” and “Cancel”. The empty state shouldn’t be used in this case.

See the following mock up for suggested improvements:
https://lizsurette.github.io/OpenStack-Design/tripleo-ui/1-deployment-workflow-for-edge-technician/img/2017-7-24-TripleO-UI_13_Jacques15.png

Steps to reproduce
==================
* Log in to UI
* Configure plan correctly
* Click "Validate and Deploy"
* Observe confirmation modal.

Expected result
===============
Modal follows structure of proposed mock up:
https://lizsurette.github.io/OpenStack-Design/tripleo-ui/1-deployment-workflow-for-edge-technician/img/2017-7-24-TripleO-UI_13_Jacques15.png