Rebalance mesh on receipt of peer subscriptions?

[achingbrain]

When the subscriptions of a peer are sent, we add them to the subscribers for a given topic, but we have to wait for the heartbeat before they (might) get added to the mesh for the topic, so there's a brief window during which we know a peer is interested in a topic, but we won't gossip any messages on that topic to them.

I'm not sure why it's like this, we could rebalance the mesh when we are informed of their subscriptions and before emitting the subscription-change event, then arbitrary delays in tests like this would not be necessary which makes everything a lot less flaky.

[dapplion]

@achingbrain That's a good point! Shouldn't be expensive to do

[stale]

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