Use module install script for acceptance tests

Use module install script for acceptance tests

This patch updates the spec_helper_acceptance.rb file to use the common
module install script and Puppetfile from the new
openstack/puppet-openstack-integration repo. This will allow us to take
advantage of Zuul's Depends-On feature so that we can test changes
across multiple related modules. This is based on idea 1 from this
brainstorming session[1].

This will probably be abstracted out into a separate function or
eventually a separate gem so that it can be more easily shared across
the OpenStack modules and the Infra modules.

[1] https://etherpad.openstack.org/p/puppet-git-dependencies

Change-Id: Ia47b609f1d05f5f9000dd977b9ded35afbe7e3f4
Co-Authored-By: James E. Blair <jeblair@hp.com>
Co-Authored-By: Spencer Krum <spencer.krum@hp.com>