topology-updater: Track new resources not present during startup

[ozhuraki]

If a device plugin registers itself with kubelet after NFD topology-updater is already running the NRT will never be updated with new resources.

Closes: #1424

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[ozhuraki]

@PiotrProkop

Could you please take a look if this is a right place to track new resources?

[PiotrProkop]

I don't think that's the right place to fix it as later call to updateAvailable will ignore the resource not present during startup here -> https://github.com/kubernetes-sigs/node-feature-discovery/blob/master/pkg/resourcemonitor/noderesourcesaggregator.go#L246

[ozhuraki]

@PiotrProkop

Thanks for the help. I checked more, would something like this account for updateAvailable()?

[ozhuraki]

@PiotrProkop

Apologies for a delay. Thanks, updated, could you please take another look?