Remove node::s_cache::protect_cache_servers from integration.yaml
Remove node::s_cache::protect_cache_servers from integration.yaml

As we don't have cache machines in Integration in Carrenza, as this
"environment" is mainly used for Jenkins now.

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