Integrate undercloud_user var into oooq-extras

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
  role
- Cleanup redundant comments in <role>/defaults/main.yml

Closes-bug: 1654574
Change-Id: I9c7a3166ed1fc5042c11e420223134ea912b45c5

roles/collect-logs/defaults/main.yml

@@ -1,6 +1,5 @@
 ---
 
-## collection related vars
 artcl_collect: true
 artcl_collect_list:
   - /var/log/

roles/collect-logs/meta/main.yml

@@ -1,3 +1,2 @@
 dependencies:
   - extras-common
-

roles/collect-logs/tasks/create-docs.yml

@@ -6,7 +6,7 @@
 
 - name: Unarchive shell scripts
   shell: >
-    gunzip "{{ artcl_collect_dir }}/undercloud/home/{{ ansible_user }}/{{ item }}.sh.gz";
+    gunzip "{{ artcl_collect_dir }}/undercloud/home/{{ undercloud_user }}/{{ item }}.sh.gz";
   with_items: "{{ artcl_create_docs_payload.included_deployment_scripts }}"
   ignore_errors: yes
   when:  artcl_gzip_only|bool
@@ -14,7 +14,7 @@
 - name: Generate rST docs from scripts and move to Sphinx src dir
   shell: >
      awk -f "{{ local_working_dir }}/usr/local/share/ansible/roles/collect-logs/scripts/doc_extrapolation.awk" \
-       "{{ artcl_collect_dir }}/undercloud/home/{{ ansible_user }}/{{ item }}.sh" > \
+       "{{ artcl_collect_dir }}/undercloud/home/{{ undercloud_user }}/{{ item }}.sh" > \
        "{{ artcl_docs_source_dir }}/{{ item }}.rst"
   with_items: "{{ artcl_create_docs_payload.included_deployment_scripts }}"
   ignore_errors: yes