Add the rest of the projects to Zuul v3

Here we go. This adds all the remaining projects to main.yaml. The
content was generated by the tox add-projects-to-main environment.

This also adds a check job to run on changes to gerrit/projects.yaml
or zuul/main.yaml to ensure they are in sync.

Change-Id: If86c4e176f9a8800bf1fcdb52e8aef9384760c9b

playbooks/check-main-yaml/post.yaml

@@ -0,0 +1,3 @@
+- hosts: all
+  roles:
+    - fetch-tox-output

playbooks/check-main-yaml/pre.yaml

@@ -0,0 +1,4 @@
+- hosts: all
+  roles:
+    - ensure-tox
+    - revoke-sudo

playbooks/check-main-yaml/run.yaml

@@ -0,0 +1,9 @@
+- hosts: all
+  roles:
+    - role: tox
+      tox_envlist: add-projects-to-main
+
+- hosts: all
+  tasks:
+    - name: Check for changes to zuul/main.yaml
+      command: git diff-files --quiet