Refine iptables rule for node exporter (#27) #890

Job	Run time
kitchen / prepare-matrix	3s
kitchen / run-kitchen-tests (ubuntu-2404)	1m 47s
kitchen / run-kitchen-tests (ubuntu-2204)	1m 52s
kitchen / run-kitchen-tests (debian-12)	1m 42s
kitchen / run-kitchen-tests (fedora-40)	1m 54s
kitchen / run-kitchen-tests (centos-stream-9)	2m 22s
kitchen / run-kitchen-tests (centos-stream-10)	2m 2s
	11m 42s

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