Export node State to NotifyLeave callback #321
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The node State was exported to the application in commit 1c2989e, but only the MergeDelegate is passed Node values with the State field initialized. The actual state of each node as tracked by the local memberlist is hidden from the application in the non-exported nodeState struct which embeds Node. Remove the State field from nodeState so that the State field on the embedded Node is instead used to track the node state. This has the effect of making the actual state of the node (Left vs. Dead) available to NotifyLeave callbacks as a pointer to the nodeState's embedded Node struct is passed to EventDelegate callbacks.
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The node State was exported to the application in #223, but only the MergeDelegate is passed Node values with the State field initialized. The actual state of each node as tracked by the local memberlist is hidden from the application in the non-exported nodeState struct which embeds Node. Remove the State field from nodeState so that the State field on the embedded Node is instead used to track the node state. This has the effect of making the actual state of the node (Left vs. Dead) available to NotifyLeave callbacks as a pointer to the nodeState's embedded Node struct is passed to EventDelegate callbacks.