58f0eaa468
When using this role, a playbook can be used to orchestrate doing all the builds on a single host. There is no need to orchestrate this inside the role. In order to gain the efficiencies of building everything on a single host, a playbook can/should be used with the setting 'venv_reuse_build_only: yes'. Which will not continue to the install stage. Change-Id: Ib6e13ca7623942f8b0663b54528599b56b05fb19