[SPARK-4631][streaming][FIX] Wait for a receiver to start before publishing test data.#4270

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dragos wants to merge 2 commits intoapache:masterfrom

dragos:issue/fix-flaky-test-SPARK-4631

Commits on Jan 29, 2015

Install callback before connecting to MQTT broker.
dragos
committed

Commits on Jan 30, 2015

[SPARK-4631][streaming] Wait for a receiver to start before publishing test data.
dragos
committed