make clippy happy #779

Job	Run time
fmt	19s
clippy	2m 25s
build	5m 14s
tests (coverage-map)	1m 21s
tests (coverage-point-calculator)	1m 44s
tests (reward-scheduler)	1m 14s
tests (task-manager)	57s
tests (ingest)	1m 54s
tests-postgres (boost-manager)	2m 39s
tests-postgres (file-store)	2m 39s
tests-postgres (iot-config)	3m 4s
tests-postgres (iot-packet-verifier)	3m 51s
tests-postgres (mobile-config)	3m 7s
tests-postgres (iot-verifier)	2m 52s
tests-postgres (mobile-packet-verifier)	2m 23s
tests-postgres (mobile-verifier)	2m 54s
build-release	15m 28s
	54m 5s

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