Remove leftover /var/run dir creation

This was added for a previous unlanded version of a change and
never removed. Oops.

Change-Id: I6006198dafac611c8ae1e2a6efcaddf5b9a60c8d

playbooks/zuul/run-production-playbook.yaml

@@ -15,11 +15,6 @@
 
 - hosts: bridge.openstack.org
   tasks:
-    - name: Ensure run dir
-      file:
-        state: directory
-        path: /var/run/ansible
-
     - name: Run the production playbook and capture logs
       block: