Remove some redundant s_mirrorer hieradata for Carrenza Integration
Remove some redundant s_mirrorer hieradata for Carrenza Integration

As the mirrorer machine hasn't been running there for a long while,
since Integration was migrated to AWS.

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