Change coverage map to treat hotspot_key as bytes rather than a Publi… #75

Job	Run time
fmt	4s
build	4m 40s
clippy	1m 36s
tests (ingest)	2m 23s
tests (mobile-packet-verifier)	1m 46s
tests (file-store)	1m 29s
tests (reward-scheduler)	1m 0s
tests (task-manager)	41s
tests-postgres (boost-manager)	2m 36s
tests-postgres (iot-config)	2m 9s
tests-postgres (iot-packet-verifier)	3m 12s
tests-postgres (iot-verifier)	2m 30s
tests-postgres (mobile-config)	2m 7s
tests-postgres (mobile-verifier)	2m 24s
build-release	0s
	28m 37s

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