thrift_client_pool: close bad channel before creating a new one #565
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We see rocksplicator based applications leaking CLOSE_WAIT sockets, which is typically
due to applications not closing its own sockets properly after the connection has been closed
by the remote server.
To fix that, when creating a new client for a destination address, we ensure the existing thrift channel (socket)
is closed, before creating a new one.
Need to test this out