improved regex for matching deb sources

[grimm26]

Fix for #1261

[chris-rock]

Awesome @grimm26 Could you please add an integration test: https://github.com/chef/inspec/blob/master/test/integration/default/apt_spec.rb and add your config to https://github.com/chef/inspec/blob/master/test/cookbooks/os_prepare/recipes/apt.rb?

[grimm26]

Will these tests actually use the updated inspec code in the PR?
It seems like a chicken and egg problem :)

[srenatus]

I've re-run the travis test (and it passed 🎉 ), but could you either squash those commits or amend 1d8ce69 with a sign-off, @grimm26? Thanks!

[grimm26]

rebase/squash done. Thanks!

[chris-rock]

Thanks @grimm26