Remove unused private function

[#173630293]

Authored-by: Matt Royal <mroyal@pivotal.io>

Author: matt-royal

app/models/runtime/domain.rb

@@ -149,10 +149,6 @@ def protocols
 
     private
 
-    def k8s_enabled?
-      Config.config.kubernetes_api_configured?
-    end
-
     def validate_change_owning_organization(organization)
       return if self.new? || owning_organization == organization