improve comments and context of iot verifier #864

Job	Run time
build	4m 2s
fmt	15s
clippy	3m 35s
tests (coverage-point-calculator)	2m 1s
tests (coverage-map)	3m 1s
tests (ingest)	3m 15s
tests (reward-scheduler)	1m 25s
tests (task-manager)	1m 21s
tests-postgres (boost-manager)	4m 18s
tests-postgres (file-store)	4m 27s
tests-postgres (iot-config)	4m 16s
tests-postgres (iot-packet-verifier)	4m 4s
tests-postgres (iot-verifier)	3m 46s
tests-postgres (mobile-config)	3m 56s
tests-postgres (mobile-packet-verifier)	3m 53s
tests-postgres (mobile-verifier)	3m 37s
build-release	0s
	51m 12s

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