This will wait for any resources that are created to become available
before exiting the script. This allows you to avoid a race condition
where a server could be created before the resource tracker had been
updated with the new resources; server creation would fail.
Change-Id: I57f8c93cb1ebbc284b96ef1ced2c4edd59b27795
Story: 2004274
Task: 27823
Depends-On: https://review.openstack.org/617642
d4e7e58619