Add a flag to disable leader election for NFD-master

[Wennn]

What would you like to be added:
Add a flag to disable leader election for NFD-master in values.yaml
Why is this needed:
When we run NFD-master on a large-scale cluster, the leader election may time out very easily, causing the NFD-master pod to panic.
In this scenario, increasing replicas won’t help because there’s always only one instance that can process the node labels. Therefore, we would like to explicitly disable the leader election to reduce the likelihood of NFD-master panic.

[marquiz]

Makes sense. I guess the logic should be if the replicacount is 1 then don't enable leader election
/help

[k8s-ci-robot]

@marquiz:
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Details

In response to this:

Makes sense. I guess the logic should be if the replicacount is 1 then don't enable leader election
/help

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