Remove `hosts::self`
Remove `hosts::self`

This was added in 6da602560539f653b222318506923e5248f23a1b but doesn't
appear to have ever been included anywhere.

There are no host entries on machines pointing to `127.0.1.1`.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet