Portal beacon LC sync can be started now from a provided trusted
block root or, in case it has been running before, from a
previously verified and stored LC bootstrap.
This required altering the the beacon db on how the bootstraps
are stored.
* Make stop functions wait for completion before return.
* Implement graceful shutdown.
* Shutdown rpc and metric servers if enabled.
* Move metrics and rpc servers out of PortalNode.
- Add basic validation for LC bootstrap gossip, validating either
by trusted block root (only 1) when not synced, or by comparing
with the header of the latest finality update when synced.
- Update portal_bridge beacon to also gossip bootstraps into the
network on each end of epoch.
- Add post Bellatrix Beacon block proof exporting to
eth_data_exporter
- Rework the Bellatrix Beacon block proof exports to us yaml
format
- Move some common code of the two different beacon block proofs
to beacon_chain_block_proof_common module
- Move + add to yaml utils to be usable not just for the tests but
also for eth data exporter
* Add nph check to fluffy CI lint
* Add a section on nph usage in the fluffy.guide
* Update copyright years for altered files
* Avoid chained methods formatting style in db code
* Update nph in CI to v0.5
* Remove leftover commented import
* Move comment to avoid nph turning complex list into simple list (nph bug)
* Update nph in CI to v0.5.1
* Formatting fluffy with nph v0.5.1
