ansible/ansible — pull request #6675 by danjenkins (2014-03-25 10:03:19+00:00)
Title: add limiting Inventory to a list of 1 or more VPCs

Due to limitations in the EC2 API you can't limit DescribeInstance

However, with the addition of VPCs you may want to limit yourself
to a particular VPC for a particular environment

This allows you to specify which VPC(s) you want to describe

My Python skills aren't great so there may be easier ways to do what I've done.