Create review-staging group

Create a review-staging group so we can bring up a new server but
avoid running the project-management steps on it.

Change-Id: I93d2a36edcd58a48a36031f0692be3273a36f07c

inventory/service/groups.yaml

@@ -195,6 +195,9 @@ groups:
     - insecure-ci-registry[0-9]*.opendev.org
   review:
     - review[0-9]*.open*.org
+  # This group disables operations like project-managment and
+  # replication.  It is intended for staging new production servers.
+  review-staging:
     - review-test.opendev.org
   static:
     - static[0-9]*.opendev.org

playbooks/manage-projects.yaml

@@ -3,7 +3,7 @@
   roles:
     - gitea-git-repos
 
-- hosts: "review:!review-test.opendev.org:!disabled"
+- hosts: "review:!review-staging:!disabled"
   name: "Create repos on gerrit servers"
   tasks:
     - name: Sync project-config