[rdo-list] tripleo-quickstart, undercloud/overcloud-post roles removal and quickstart-role-requirements deprecation

Greetings, In order to replace instack-virt-setup [1] the undercloud-post and overcloud roles native to quickstart will be removed. As to not impact current users of TripleO-Quickstart these roles will be moved w/ git history into ansible-role-tripleo-overcloud and ansible-role-tripleo-undercloud-post. This was covered in the latest RDO-Infra meeting [3]. Moving the native quickstart roles may impact the current users of these roles. To prevent anything from breaking we will be pinning the undercloud-post and overcloud roles to the latest known good commit [2]. We'll need [2] merged immediately to begin this work. I will keep the list updated, let me know if anyone has a problem. Thanks! [1] https://blueprints.launchpad.net/tripleo/+spec/tripleo-quickstart [2] https://review.openstack.org/#/c/356669/ [3] https://review.rdoproject.org/etherpad/p/rdo-infra-scrum lines 58 - 69