Deadlock in kafka_interadapter_proxy when timeout happens at the same time as dispatchResponse

1) InvokeRPC Calls SubscribeForResponse, allocates a channel
2) wait_for_messages receives a message, launches a goroutine to handleMessage
3) handleMessage launches a goroutine to dispatchMessage
4) dispatchResponse grabs lockTransactionIdToChannelMap
5) dispatchResponse attempts to send on channel, blocks on send.
6) InvokeRPC timesout and exits, calling deferred unSubscribeForResponse
7) unSubscribeForResponse calls deleteFromTransactionIdChannelMap
8) deleteFromTransactionIdChannelMap attempts to grab lockTransactionIdToChannelMap