Use a newer JDK.
Use newer Jinja syntax to avoid deprecations

`${}`-style variable interpolation is going to be removed in a version of
Ansible coming out soon; this replaces its usage with `{{ }}` interpolation
and quoting.
Missed a quote.
Recursive reference within jenkins: dictionary.

Apparently it was a bug that this worked! Reference:

https://github.com/ansible/ansible/issues/2744
Merge pull request #5 from smashwilson/updates

Syntax deprecation.