When a node joins a network it sends out a gossip event before it
updates it's own in-memory state. This can create a race where the node
gets the event back from a remote node before we update in-memory state
and we treat that as latest state. To avoid this race, always generate
the gossip after updating local state.
Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
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