[WIP] Fix collect_output in check-aggregate.rb

[ttarczynski]

Pull Request Checklist

It's related to: #19

General

• [ ] Update Changelog following the conventions laid out on Keep A Changelog

• [ ] Update README with any necessary configuration snippets

• [ ] Binstubs are created if needed

• [x] RuboCop passes

• [x] Existing tests pass

Purpose

Trying to fix --output option to work with named aggregates.

Known Compatablity Issues

I've tried to make this change compatible with both sensu 0.23 and => 0.24.0 but I think the API changes are to big to maintain compatibility. I'll cleanup the conditionals that are meant to provide compatibility with 0.23.

[majormoses]

@ttarczynski this still a WIP?

[majormoses]

closing due to inactivity, if you intend to see this through to completion reply back and I will re-open.