Use required-projects in bootstrap-bridge

The required-projects list is necessary for bootstrap-bridge to know
which repos to update on bridge. Since bootstrap-bridge doesn't know
which child jobs will followup we update the four repos that bridge
depends on.

Change-Id: Ib31c67a20021665105b2567a65b94f7510e87d5b

zuul.d/infra-prod.yaml

@@ -50,6 +50,15 @@
     # date on bridge before we run our playbooks.
     nodeset:
       nodes: []
+    # TODO(clarkb) cleanup required projects on child jobs that no longer set
+    # up git repo sources.
+    # Update all four of the git repos that we use on bridge as we don't know
+    # which repos will be relied on by subsequent jobs.
+    required-projects:
+      - opendev/ansible-role-cloud-launcher
+      - opendev/ansible-role-puppet
+      - opendev/system-config
+      - openstack/project-config
 
 - job:
     name: infra-prod-playbook