KIP-1016 — Make MM2 heartbeats topic name configurable

Discussion MirrorMaker

Makes the MirrorMaker2 heartbeats topic name configurable via a new deafult.replication.policy.heartbeats.topic.name MirrorConnectorConfig property, defaulting to the existing heartbeats value. The hard-coded heartbeats topic name in DefaultReplicationPolicy caused naming collisions when multiple MM2 instances or other systems used the same topic name in the same cluster.

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