[API-466] Fire membership events when HotRestart is enabled #412
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With this change, we now clear the memberlist when the cluster changes,
instead of just clearing the memberlist version so that, we can
fire events when a member with HotRestart enabled restarts with
the same UUID. Added a test that verifies this behavior.
Also, removed an unnecessary usage of the
clear_member_list_version
method.
closes #371