Add note about re-running with the same name. Openstack does the right thing!

playbooks/transient_cloud_instance.yml

@@ -15,6 +15,11 @@
 # instance_type=some instance type (default is m1.small)
 # root_auth_users='user1 user2 user3' (default is sysadmin-main group)
 #
+# Note: if you run this playbook with the same name= multiple times
+# openstack is smart enough to just return the current ip of that instance
+# and go on. This way you can re-run if you want to reconfigure it without
+# reprovisioning it.
+#
 
 - name: check/create instance
   hosts: lockbox01.phx2.fedoraproject.org