stacks-node appears to stall during bootup in develop

[kantai]

This impacted the Xenon miner running an atlas+develop branch: the node appeared to stall during bootup due to "nack"s received from the miner's bootstrap node. The miner was able to be nudged out of this state using the chain pusher tool, but there's likely a bug somewhere here that needs to be addressed.

[jcnelson]

I think I've figured out why this is -- the relayer isn't waking up the chains coordinator when it receives a confirmed microblock stream, and nothing else. This happens more often than not, and really should be the cause of a wake-up event because the arrival of confirmed microblocks can render already-downloaded Stacks blocks processable. The current code erroneously uses either the arrival of a Stacks block or an unconfirmed microblock, but ignores the arrival of confirmed microblocks. Will send a PR once my testnet node finishes sync'ing.

[jcnelson]

Yup, that was the problem. Confirmed that my testnet node continuously streams blocks and microblocks with the fix.

[jcnelson]

PR sent

[blockstack-devops]

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