starius / btcd / 23366784097

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rpcclient: avoid duplicate batch POST handlers

NewBatch called New() and then called start() again. In HTTP POST mode that
created a second sendPostHandler and another shutdown-cancel goroutine, which
broke the expected single-flight serialization of POST sends.

Keep NewBatch as a semantic toggle only: rely on New() to start handlers
once, then set batch=true. A regression test now checks that batch POST
requests stay serialized through one active transport call.

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