Make master repos contain all distros

We are creating the proper groups, assigning hosts to the proper
groups, but then we are not creating the group of the master
servers properly, because only the nodes that look like the
localhost would be matching the when clause.

Change-Id: I99d279dae5dc3f73b3a337ed70e25877a8995cc0
(cherry picked from commit 6e894ee7ed)

playbooks/repo-build.yml

@@ -35,12 +35,11 @@
   tasks:
     - name: Prepare group of master repo servers
       add_host:
-        name: "{{ item }}"
+        name: "{{ groups[item][0] }}"
         groups: repo_masters
       when:
-        - "item in groups['repo_servers_' + ansible_distribution_version + '_' + ansible_architecture][0]"
-      with_inventory_hostnames:
-        - repo_all
+        - "item.find('repo_servers_') != -1"
+      with_items: "{{ groups }}"
   tags:
     - always
     - repo-build