Convert back to zuul.projects

Zuul has transitioned zuul.projects to a dict that mirrors
zuul._projects.  Convert users back to zuul.projects so we can remove
the underscore version in zuul.

Change-Id: Ib71241a862cf29f6e542dc1d4a2c5cd554d5d7d8
Depends-On: I3c011f72933e98ccbf8badf0e9197c8659766c51

playbooks/release/pre.yaml

@@ -5,7 +5,7 @@
       command: "git remote add origin https://{{ item.canonical_name }}"
       args:
         chdir: "{{ ansible_user_dir }}/src/{{ item.canonical_name }}"
-      with_items: "{{ zuul._projects.values() | list }}"
+      with_items: "{{ zuul.projects.values() | list }}"
       # ANSIBLE0006: git remote add is not supported by ansible module
       tags:
         - skip_ansible_lint

roles/use-cached-repos/tasks/main.yaml

@@ -1,7 +1,7 @@
 - name: Find locally cached git repos
   stat:
     path: "/opt/git/{{ item.name }}"
-  with_items: "{{ zuul._projects.values() | list }}"
+  with_items: "{{ zuul.projects.values() | list }}"
   register: cached_repos
 
 - name: Clone cached repo to workspace
@@ -10,7 +10,7 @@
     creates: "{{ ansible_user_dir }}/{{ item.0.src_dir}}"
   when: item.1.stat.exists
   with_together:
-    - "{{ zuul._projects.values() | list }}"
+    - "{{ zuul.projects.values() | list }}"
     - "{{ cached_repos.results }}"
   # ANSIBLE0006: If we use the git module, we get warning
   # ANSIBLE0004 since we  do not give an explicit version
@@ -23,7 +23,7 @@
     creates: "{{ ansible_user_dir }}/{{ item.0.src_dir}}"
   when: not item.1.stat.exists
   with_together:
-    - "{{ zuul._projects.values() | list }}"
+    - "{{ zuul.projects.values() | list }}"
     - "{{ cached_repos.results }}"
   # ANSIBLE0006: If we use the git module, we get warning
   # ANSIBLE0004 since we  do not give an explicit version
@@ -34,7 +34,7 @@
   command: "git remote rm origin"
   args:
     chdir: "{{ ansible_user_dir }}/{{ item.src_dir}}"
-  with_items: "{{ zuul._projects.values() | list }}"
+  with_items: "{{ zuul.projects.values() | list }}"
   # ANSIBLE0006: git remote is not supported by ansible module
   tags:
     - skip_ansible_lint