nfd-worker: Add an option to disable setting the owner references

[ozhuraki]

In some cases it's desirable to control automatic garbage collection of NodeFeature object.

Add an option to disable setting the owner references to Pod for NodeFeature object.

Closes: #1817

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Hi @ozhuraki. Thanks for your PR.

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[marquiz]

Thank you @ozhuraki for the improvement! Just one nit about the wording (we don't just mark to pod as the owner but also the parent owner of the pod). E.g.

Suggested change

	Setting `core.noOwnerRefs` to `true` disables setting the owner references
	to Pod for NodeFeature object.
	Setting `core.noOwnerRefs` to `true` disables setting the owner references
	of the NodeFeature object created by the nfd-worker.

Ditto the cmdline reference

[marquiz]

/ok-to-test