Add script to prepare a ci-overcloud

Script what needs to be done in order to prepare a ci-overcloud for CI
Currently a WIP, a few things still need to be ironed out. Also run this
at the end of deploy-ci-overcloud, it currenlty hardcoded to the HP
region but so it the rest of deploy-ci-overcloud.

Co-Authored-By: Robert Collins <rbtcollins@hp.com>
Change-Id: I461a840710625294a2aef1a1e08a3ed852e946ab
Merge "Add script to prepare a ci-overcloud"