ansible/ansible — pull request #1711 by dhozac (2012-12-02 14:47:52+00:00)
Title: Add a flatten lookup plugin

This merges two or more lists together into one, allowing constructs like
```
vars:
defaults: [a, b, c]
tasks:
- action: ...
with_flatten:
- $defaults
- $groupvar
- $hostvar
```