include all/vars only once

and there is no need to load it in every playbook in pre_tasks

tasks/yumrepos.yml

@@ -1,4 +1,9 @@
 ---
+- name: Include vars/all/
+  include_vars:
+    dir: /srv/web/infra/ansible/vars/all/
+    ignore_files: [README]
+
 - name: put rhel repos on rhel systems
   copy: src="{{ files }}/common/rhel{{ ansible_distribution_major_version }}.repo" dest="/etc/yum.repos.d/rhel{{ ansible_distribution_major_version }}.repo"
   when: ansible_distribution == 'RedHat' and not inventory_hostname.startswith('ppc9')