Commits on Feb 5, 2020

1. Use cluster-dns IP setup by kubeadm …

   Removed hardcoded `cluster-dns` IP 10.96.0.10, this allows kubelet to use `clusterDNS` configured by kubeadm in `/var/lib/kubelet/config.yaml`
   
   Tested by starting minikube with `--service-cluster-ip-range=100.64.0.0/13` and verifying DNS resolution works.
   
   /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
   ```
   [Unit]
   Wants=docker.socket
   
   [Service]
   ExecStart=
   ExecStart=/var/lib/minikube/binaries/v1.17.0/kubelet --authorization-mode=Webhook --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --cgroup-driver='cgroupfs' --client-ca-file=/v
   ar/lib/minikube/certs/ca.crt --cluster-domain=cluster.local --config=/var/lib/kubelet/config.yaml --container-runtime=docker --fail-swap-on=false --hostname-override=minikube --kubeconfig=/e
   tc/kubernetes/kubelet.conf --node-ip=192.168.64.7 --pod-manifest-path=/etc/kubernetes/manifests
   
   [Install]
   ```
   
   DNS resolution test
   ```
   kubectl run -i --tty --rm busybox --image=busybox --restart=Never -- sh
   If you don't see a command prompt, try pressing enter.
   / # nslookup kubernetes.io
   Server:		100.64.0.10
   Address:	100.64.0.10:53
   
   Non-authoritative answer:
   Name:	kubernetes.io
   Address: 147.75.40.148
   ```
   
   Fixes: kubernetes#5727
   
   fix lint errors

   

   vijaykatam committed Feb 5, 2020
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