Support new location source field on wifi heartbeats #253

Job	Run time
build	5m 11s
clippy	1m 54s
fmt	12s
tests (coverage-map)	1m 28s
tests (coverage-point-calculator)	1m 46s
tests (file-store)	1m 50s
tests (ingest)	1m 56s
tests (mobile-packet-verifier)	2m 12s
tests (reward-scheduler)	1m 2s
tests (task-manager)	1m 19s
tests-postgres (boost-manager)	3m 24s
tests-postgres (iot-config)	2m 34s
tests-postgres (iot-packet-verifier)	4m 12s
tests-postgres (iot-verifier)	2m 41s
tests-postgres (mobile-config)	2m 30s
tests-postgres (mobile-verifier)	3m 1s
build-release	0s
	37m 12s

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