Add become for log delete

In certain usecases some log files are generated by other tools and
might have unexpected permissions set to them added become to avoid
issues related in permissions

Author: eshulman2

clean_openstack_deployment.yaml

@@ -15,3 +15,4 @@
       loop:
         - "/home/zuul/ci-framework-data/logs"
         - "/home/zuul/ci-framework-data/tests"
+      become: true