Move pre_tasks from to the openstack provisioner

We should probably not pollute the role namespace with a name as common
as "common". Moving the pre_task.yml to provisioners/openstack instead.

roles/common/pre_tasks/pre_tasks.yml

@@ -16,6 +16,7 @@
   delegate_to: localhost
 
 - name: Set Dynamic Inventory Filters
+  become: false
   shell: >
     export OS_INV_FILTER_KEY=clusterid && OS_INV_FILTER_VALUE={{ env_id }}
   delegate_to: localhost