Add mock speedtest constructor (#828) #105

Job	Run time
clippy	1m 47s
build	4m 4s
fmt	12s
tests (mobile-packet-verifier)	2m 30s
tests (ingest)	2m 5s
tests (file-store)	1m 35s
tests (reward-scheduler)	1m 5s
tests (task-manager)	42s
tests-postgres (boost-manager)	3m 15s
tests-postgres (iot-config)	2m 23s
tests-postgres (iot-packet-verifier)	3m 56s
tests-postgres (iot-verifier)	3m 15s
tests-postgres (mobile-verifier)	3m 27s
tests-postgres (mobile-config)	2m 28s
build-release	0s
	32m 44s

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