Use dev subdir on review-dev for project-config things

This is in anticipation of running manage-projects, which wants to
use the dev subdir of project-config when run on dev, but we're
currently not doing anything with that. Point at root or dev as
appropriate. Then we can do a similar thing - probably just
bind-mounting the root or the dev when we docker run for
manage-projects.

Change-Id: Ia13bbb0bf8dbe1f7e7c0f378ba9b41bef3ecd5c1

playbooks/host_vars/review-dev01.opendev.org.yaml

@@ -10,3 +10,4 @@ letsencrypt_gid: 3001
 gerrit_storyboard_url: https://storyboard-dev.openstack.org
 gerrit_vhost_name: review-dev.opendev.org
 gerrit_redirect_vhost: review-dev.openstack.org
+gerrit_project_config_base: /opt/project-config/dev

playbooks/roles/gerrit/defaults/main.yaml

@@ -17,3 +17,4 @@ gerrit_container_volumes:
   - /home/gerrit2/.launchpadlib:/var/gerrit/.launchpadlib
   - /home/gerrit2/.ssh:/var/gerrit/.ssh
 gerrit_database_type: MYSQL
+gerrit_project_config_base: /opt/project-config

playbooks/roles/gerrit/tasks/main.yaml

@@ -202,7 +202,7 @@
 
 - name: Copy notify-impact yaml file
   copy:
-    src: "/opt/project-config/gerrit/notify_impact.yaml"
+    src: "{{ gerrit_project_config_base }}/gerrit/notify_impact.yaml"
     dest: "{{ gerrit_site_dir }}/hooks/notify_impact.yaml"
     remote_src: yes
     owner: "{{ gerrit_user_name }}"