Fixed a case where received messages may not be released properly #11
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Fixed a case where received messages may not be released properly if a lot of requests are timing out before their responses are received. This can happen when the netty channel thread receives an older response while a current response is being processed by a driver thread.
The fix is to make sure the channel's state attribute is cleared as soon as the channel handler receives a valid response and notifies the driver thread. The state is also cleared when the driver thread releases the channel.