independent: update CoreDNS mentions for kubeadm (#8753)

Give CoreDNS instead of kube-dns examples in:
- docs/setup/independent/create-cluster-kubeadm.md
- docs/setup/independent/troubleshooting-kubeadm.md

content/en/docs/setup/independent/create-cluster-kubeadm.md

@@ -48,7 +48,7 @@ but you may also on other OSes.
 | Config file API           | alpha          |
 | Self-hosting              | alpha          |
 | kubeadm alpha subcommands | alpha          |
-| CoreDNS                   | alpha          |
+| CoreDNS                   | GA             |
 | DynamicKubeletConfig      | alpha          |
 
 
@@ -74,6 +74,7 @@ timeframe; which also applies to `kubeadm`.
 | v1.8.x             | September 2017 | June 2018         |
 | v1.9.x             | December 2017  | September 2018    |
 | v1.10.x            | March 2018     | December 2018     |
+| v1.11.x            | June 2018      | March 2019        |
 
 {{% /capture %}}
 
@@ -176,7 +177,7 @@ The output should look like:
 [bootstraptoken] Configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
 [bootstraptoken] Configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
 [bootstraptoken] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
-[addons] Applied essential addon: kube-dns
+[addons] Applied essential addon: CoreDNS
 [addons] Applied essential addon: kube-proxy
 
 Your Kubernetes master has initialized successfully!
@@ -225,9 +226,8 @@ created and deleted with the `kubeadm token` command. See the
 You **MUST** install a pod network add-on so that your pods can communicate with
 each other.
 
-**The network must be deployed before any applications.  Also, kube-dns, an
-internal helper service, will not start up before a network is installed. kubeadm only
-supports Container Network Interface (CNI) based networks (and does not support kubenet).**
+**The network must be deployed before any applications. Also, CoreDNS will not start up before a network is installed.
+kubeadm only supports Container Network Interface (CNI) based networks (and does not support kubenet).**
 
 Several projects provide Kubernetes pod networks using CNI, some of which also
 support [Network Policy](/docs/concepts/services-networking/networkpolicies/). See the [add-ons page](/docs/concepts/cluster-administration/addons/) for a complete list of available network add-ons. IPv6 support was added in [CNI v0.6.0](https://github.com/containernetworking/cni/releases/tag/v0.6.0). [CNI bridge](https://github.com/containernetworking/plugins/blob/master/plugins/main/bridge/README.md) and [local-ipam](https://github.com/containernetworking/plugins/blob/master/plugins/ipam/host-local/README.md) are the only supported IPv6 network plugins in 1.9.
@@ -334,10 +334,10 @@ kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$kubever"
 
 
 Once a pod network has been installed, you can confirm that it is working by
-checking that the kube-dns pod is Running in the output of `kubectl get pods --all-namespaces`.
-And once the kube-dns pod is up and running, you can continue by joining your nodes.
+checking that the CoreDNS pod is Running in the output of `kubectl get pods --all-namespaces`.
+And once the CoreDNS pod is up and running, you can continue by joining your nodes.
 
-If your network is not working or kube-dns is not in the Running state, check
+If your network is not working or CoreDNS is not in the Running state, check
 out our [troubleshooting docs](/docs/setup/independent/troubleshooting-kubeadm/).
 
 ### Master Isolation

content/en/docs/setup/independent/troubleshooting-kubeadm.md

@@ -96,19 +96,19 @@ sudo kubeadm reset
 
 Right after `kubeadm init` there should not be any such Pods. If there are Pods in
 such a state _right after_ `kubeadm init`, please open an issue in the kubeadm repo.
-`kube-dns` should be in the `Pending` state until you have deployed the network solution.
+CoreDNS should be in the `Pending` state until you have deployed the network solution.
 However, if you see Pods in the `RunContainerError`, `CrashLoopBackOff` or `Error` state
-after deploying the network solution and nothing happens to `kube-dns`, it's very
+after deploying the network solution and nothing happens to the DNS server, it's very
 likely that the Pod Network solution that you installed is somehow broken. You
 might have to grant it more RBAC privileges or use a newer version. Please file
 an issue in the Pod Network providers' issue tracker and get the issue triaged there.
 
-#### `kube-dns` is stuck in the `Pending` state
+#### CoreDNS is stuck in the `Pending` state
 
 This is **expected** and part of the design. kubeadm is network provider-agnostic, so the admin
 should [install the pod network solution](/docs/concepts/cluster-administration/addons/)
 of choice. You have to install a Pod Network
-before `kube-dns` may deployed fully. Hence the `Pending` state before the network is set up.
+before CoreDNS may deployed fully. Hence the `Pending` state before the network is set up.
 
 #### `HostPort` services do not work