Use dev_id to prevent db lock contention during dev genesis creation #3407
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Motivation
During testing, we often experienced lock contention, apparently because all dev nodes temporarily initialized a DB using
dev(0)
.Also shortened
development_private_keys
todev_keys
to preventcargo fmt
from adding many lines of code.Test Plan
Tested locally. The adjusted
load_or_compute_genesis
function is only used in dev mode.