class RuboCop::Cop::Chef::RedundantCode::OhaiAttributeToString

Many Ohai node attributes are already strings and don’t need to be cast to strings again

@example

### incorrect
node['platform'].to_s
node['platform_family'].to_s
node['platform_version'].to_s
node['fqdn'].to_s
node['hostname'].to_s
node['os'].to_s
node['name'].to_s

### correct
node['platform']
node['platform_family']
node['platform_version']
node['fqdn']
node['hostname']
node['os']
node['name']