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: I1408a15d4da274f3fc911f03d5572f4818bc4ebb
Depends-On: I3c011f72933e98ccbf8badf0e9197c8659766c51

roles/mirror-workspace-git-repos/tasks/main.yaml

@@ -4,13 +4,13 @@
     value: ignore
     scope: local
     repo: "{{ ansible_user_dir }}/{{ item.value.src_dir}}"
-  with_dict: "{{ zuul._projects }}"
+  with_dict: "{{ zuul.projects }}"
 
 - name: Synchronize src repos to workspace directory
   command: "git push --mirror git+ssh://{{ ansible_user }}@{{ ansible_host }}/{{ ansible_user_dir }}/{{ item.value.src_dir}}"
   args:
     chdir: "{{ zuul.executor.work_root }}/{{ item.value.src_dir }}"
-  with_dict: "{{ zuul._projects }}"
+  with_dict: "{{ zuul.projects }}"
   delegate_to: localhost
   # ANSIBLE0006: Skip linting since it triggers on the "git" command,
   # but push is not supported by ansible git module.
@@ -22,7 +22,7 @@
   shell: "echo '{{ item.key }}:' $(git status | head -1 |awk '{ print $NF }')"
   args:
     chdir: "{{ zuul.executor.work_root }}/{{ item.value.src_dir }}"
-  with_dict: "{{ zuul._projects }}"
+  with_dict: "{{ zuul.projects }}"
   delegate_to: localhost
   register: project_heads_yaml
   # ANSIBLE0006: Skip linting since it triggers on the "git" command,
@@ -46,7 +46,7 @@
     git checkout {{ project_heads[item.key] }}
   args:
     chdir: "{{ ansible_user_dir }}/{{ item.value.src_dir }}"
-  with_dict: "{{ zuul._projects }}"
+  with_dict: "{{ zuul.projects }}"
   # ANSIBLE0006: Skip linting since it triggers on the "git" command,
   # but we prefer the shell above
   tags:

roles/tox/tasks/siblings.yaml

@@ -10,4 +10,4 @@
     tox_envlist: "{{ tox_envlist }}"
     tox_constraints_file: "{{ tox_constraints_file | default(omit) }}"
     project_dir: "{{ zuul_work_dir }}"
-    projects: "{{ zuul._projects.values() | selectattr('required') | list }}"
+    projects: "{{ zuul.projects.values() | selectattr('required') | list }}"