210eb9b743
Create an internal function pqDropConnection that does the physical socket close and cleans up closely-associated state. This removes a bunch of ad hoc, not always consistent closure code. The ulterior motive is to have a single place to wait for a spawned child backend to exit, but this seems like good cleanup even if that never happens. I went back and forth on whether to include "conn->status = CONNECTION_BAD" in pqDropConnection's actions, but for the moment decided not to. Only a minority of the call sites actually want that, and in any case it's arguable that conn->status is slightly higher-level state, and thus not part of this function's purview.
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