Maintain shadow cluster metadata for bootstrapping #1753
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Fixes #1751 (and part of #1741, related to hostname verification). This PR puts bootstrap metadata into a shadow metadata "cluster", similar to the java client. This moves dns resolution for multi-interface hostnames into BrokerConnection.connect(). And it gives each bootstrap server a unique node-id (rather than all sharing a single node-id of
bootstrap), which allows the KafkaClient to manage connection attempts more consistently using least-loaded-node, etc.This change is