Updating docs to include IKS in various places (#10047)

* Change product name

From IBM Cloud Container Service to IBM Cloud Kubernetes Service

* Adding IKS to the table of solutions

Not sure about where in the table it should be placed. The note said,
“The above table is ordered by version test/used in nodes, followed by
support level.”

* Adding IKS to Cloud Providers page

* Adding IBM Cloud Container Registry to private registry topic

* Updating language on cloud provider page

* Revising text for the registry entry

* Specifying that it's calico network policies

data/setup.yml

@@ -38,7 +38,7 @@ toc:
     path: https://cloud.google.com/kubernetes-engine/docs/before-you-begin/
   - title: Running Kubernetes on Azure Container Service
     path: https://docs.microsoft.com/en-us/azure/container-service/container-service-kubernetes-walkthrough
-  - title: Running Kubernetes on IBM Cloud Container Service
+  - title: Running Kubernetes on IBM Cloud Kubernetes Service
     path: https://console.bluemix.net/docs/containers/container_index.html
 
 - title: Turn-key Cloud Solutions