Radios that earn 0 rewards should be removed from coverage map #607

Job	Run time
fmt	15s
build	2m 41s
clippy	2m 6s
tests (coverage-map)	1m 35s
tests (coverage-point-calculator)	1m 52s
tests (ingest)	2m 7s
tests (reward-scheduler)	1m 2s
tests (task-manager)	1m 0s
tests-postgres (boost-manager)	2m 30s
tests-postgres (file-store)	2m 47s
tests-postgres (iot-config)	2m 26s
tests-postgres (iot-packet-verifier)	4m 18s
tests-postgres (iot-verifier)	2m 48s
tests-postgres (mobile-config)	2m 23s
tests-postgres (mobile-packet-verifier)	2m 55s
tests-postgres (mobile-verifier)	3m 3s
build-release	0s
	35m 48s

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