boto/boto — pull request #1677 by danielgtaylor (2013-08-20 18:49:47+00:00)
Title: Update SecurityGroup instance fetching to use filters; Fixes VPC instance issue

This pull request merges #1665 from @arturhoo which does the following:

* Switch to using filters to fetch a SecurityGroup's instances
* Makes sure to fetch instances in a VPC correctly
* Add a unit test to show this doesn't break existing functionality (added by @danielgtaylor)

@toastdriven please review.