install scripts need update

[cchen7]

https://github.com/Azure/azure-container-networking/blob/master/scripts/install-cni-plugin.sh
missing portmap or other cni bin if you just running this script with a new cluster
it will cause the coredns Initialization failed
Consider to install kubernetes-cni from OS repo

[rbtr]

This script is only concerned with installing azure-vnet, if you need other CNI plugins or node setup, it needs to be done separately.

[github-actions]

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