openqa/workers: skip nbde-client on a64 workers

They aren't encrypted, and it causes networking config problems.
We'd like to solve the underlying problem but we don't know how,
this is good enough for now. Also drop the workaround things
again because they don't seem to help.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

playbooks/groups/openqa-workers.yml

@@ -12,22 +12,6 @@
   - include_vars: dir=/srv/web/infra/ansible/vars/all/ ignore_files=README
   - import_tasks: "{{ tasks_path }}/yumrepos.yml"
 
-  - name: override nbde_client-network-flush to work around bug
-    copy:
-      src: "{{ files }}/common/nbde_client-network-flush"
-      dest: /usr/bin/nbde_client-network-flush
-      owner: root
-      group: root
-      mode: 755
-
-  - name: tell NetworkManager we don't want any auto connections
-    copy:
-      src: "{{ files }}/common/noautodefault.conf"
-      dest: /etc/NetworkManager/conf.d/noautodefault.conf
-      owner: root
-      group: root
-      mode: 644
-
   roles:
    - { role: base, tags: ['base'] }
    - { role: rkhunter, tags: ['rkhunter'] }
@@ -37,7 +21,7 @@
    - { role: collectd/base, tags: ['collectd_base'] }
    - { role: sudo, tags: ['sudo'] }
    - { role: openqa/worker, tags: ['openqa_worker'] }
-   - { role: linux-system-roles.nbde_client, tags: ['nbde_client'], when: datacenter == 'iad2' }
+   - { role: linux-system-roles.nbde_client, tags: ['nbde_client'], when: datacenter == 'iad2' and not inventory_hostname.startswith 'openqa-a64' }
    - apache
 
   tasks: