We need to differentiate local_working_dir from working_dir
as well as decouple the stack user from `ansible_user` var.
Both of these are causing issues as we begin to automate
deployments in more environments.
- Cleanup duplicate variables that are consumed via extras-common
- Note: extras-common depends on the common role in OOOQ
- Cleanup redundant var and superfluous quotes from overcloud-scale
- Cleanup redundant comments in <role>/defaults/main.yml
As more ansible variables are shared or reused across roles it is
important to define these variables in a role that is always
executed. In this case that role is extras-common.
Note: This review is a blocker for https://review.openstack.org/#/c/418998/