improve comments and context of iot verifier #866

Job	Run time
build	3m 44s
clippy	2m 59s
fmt	20s
tests (coverage-map)	2m 34s
tests (coverage-point-calculator)	2m 18s
tests (ingest)	3m 16s
tests (reward-scheduler)	1m 14s
tests (task-manager)	1m 21s
tests-postgres (boost-manager)	3m 40s
tests-postgres (file-store)	4m 1s
tests-postgres (iot-config)	3m 37s
tests-postgres (iot-packet-verifier)	4m 6s
tests-postgres (iot-verifier)	3m 25s
tests-postgres (mobile-config)	3m 42s
tests-postgres (mobile-packet-verifier)	4m 13s
tests-postgres (mobile-verifier)	4m 19s
build-release	0s
	48m 49s

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