Support new location source field on wifi heartbeats #117

Job	Run time
fmt	4s
clippy	1m 38s
build	4m 35s
tests (coverage-point-calculator)	1m 15s
tests (coverage-map)	1m 12s
tests (file-store)	1m 27s
tests (ingest)	1m 37s
tests (reward-scheduler)	44s
tests (mobile-packet-verifier)	1m 48s
tests (task-manager)	48s
tests-postgres (boost-manager)	2m 44s
tests-postgres (iot-packet-verifier)	3m 23s
tests-postgres (iot-config)	2m 20s
tests-postgres (iot-verifier)	2m 14s
tests-postgres (mobile-config)	2m 38s
tests-postgres (mobile-verifier)	2m 7s
build-release	0s
	30m 34s

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