When using Ansible with python3, the result of
the intersect filter is a set, not a list. This
causes a failure when trying to access item 0
in the list.
In this patch we cast the set to a list before
accessing item 0. This will work for both
python2 and python3.
Change-Id: Ida1b877d41521c284f6c91377ca7ccfc5a6bcecd