[nfs-example] Use Deployments instead of ReplicationController

[HusseinKabbout]

According to the official kubernetes documentation it is recommended to use a Deployment instead of a ReplicationController to set up replication
https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller/

[linux-foundation-easycla]

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• ✅ login: HusseinKabbout / name: hka (b89d392)

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[sebgoa]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: HusseinKabbout, sebgoa

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[sebgoa]

@HusseinKabbout thanks for this. you will need to fix your CLA for this to get merged