ansible/ansible-modules-core — pull request #435 by robbwagoner (2014-12-03 15:21:35+00:00)
Title: Fix for Issue #273 ec2_lc

So that the module will work for EC2 classic Launch Configs,
`assign_public_ip` should default to `None`.
For VPCs, it should be set to 'yes' or 'no'.