Use config files for kube-proxy instead of command line args

[surajssd]

Currently kube-proxy throws such warnings in its logs:

W0113 12:08:48.344275       1 server.go:226] WARNING: all flags other than --config, --write-config-to, and
--cleanup are deprecated. Please begin using a config file ASAP.

Fix the above warning by using the config files mounted from configmap.

[knrt10]

Related #1284

[invidian]

Note that the configuration file is still in alpha: https://pkg.go.dev/k8s.io/kube-proxy@v0.20.2/config/v1alpha1. Do we want to rely on alpha features?

[surajssd]

Related #1284

@knrt10 isn't it kubelet only? While this issue deals with kube-proxy!

Note that the configuration file is still in alpha: https://pkg.go.dev/k8s.io/kube-proxy@v0.20.2/config/v1alpha1. Do we want to rely on alpha features?

That ASAP in the comment really got me.

[knrt10]

@knrt10 isn't it kubelet only? While this issue deals with kube-proxy!

Yes, I meant related not duplicate :-). Someone taking up any of the issue can close both at the same time