Add support for recycling "leaf" connections #60
Merged
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Along with #58, this should be the other half of the solution to resolve #59.
This allows the leaf level transports to be periodically re-created. That way, if by chance a single pool ends up in a state of limited diversity (too many transports with persistent connections to the same backend), re-creating the transport will allow it a chance to contact a different backend, and thus be continually changing the mix of target backends.