Allow users to enable Bandwidth Manager feature of cilium through clusterconfig

[abhinavmpandey08]

What would you like to be added: I would like to be able to enable Bandwidth Manager feature of cilium directly through cluster config.

Why is this needed: Bandwidth manager is a feature in cilium which allows you to limit bandwidth available to individual pods. This is currently a feature that needs to be enabled explicitly by setting the following value in the cilium helm chart

  --set bandwidthManager=true

Users can enable separately after the cluster is created by editing the cilium-config configMap and setting data.enable-bandwidth-manager to true

kubectl  edit cm -n kube-system cilium-config

data.enable-bandwidth-manager: "true"