[Reviewer: Matt, From: Alex] Open up ports 6667 on homestead and homer

Matt, please could you review this change to open up ports 6666 _and_ 6667 on homestead, and 6667 _only_ on homer. This is a co-req change to moving crest to publish to port 6667.

Once this is pushed I will update [Clearwater IP port usage](https://github.com/Metaswitch/clearwater-docs/wiki/Clearwater%20IP%20Port%20Usage)

Tested by spinning up a new deployment and checking security group settings manually.