Radios that earn 0 rewards should be removed from coverage map #621

Job	Run time
clippy	2m 2s
build	2m 54s
fmt	19s
tests (ingest)	1m 57s
tests (coverage-map)	1m 27s
tests (coverage-point-calculator)	1m 35s
tests (reward-scheduler)	1m 24s
tests (task-manager)	1m 19s
tests-postgres (boost-manager)	2m 32s
tests-postgres (file-store)	2m 17s
tests-postgres (iot-config)	2m 41s
tests-postgres (iot-verifier)	2m 33s
tests-postgres (iot-packet-verifier)	3m 59s
tests-postgres (mobile-config)	2m 27s
tests-postgres (mobile-packet-verifier)	2m 32s
tests-postgres (mobile-verifier)	2m 54s
build-release	0s
	34m 52s

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