Zachary Bowen e6893632dc Create migration election class (#2535). ...

* Problem: We need a way to synchronize a halt to block production to allow for upgrades across breaking changes.

* Solution: Created `MigrationElection`.

* Problem: Need documentation for `migration` elections.

* Solution: Updated the docs.

* Problem: `MigrationElection` needs 'new' CLI method.

* Solution: Updated the definition of `election` to include the new `migration` type.

* Problem: The way `end_block` checks for concluded elections assumes there is only one type of election (so we can't conclude an `upsert-validator` and a `chain-migration` at the same height).

* Solution: Re-engineered the code in `Elections` to conclude multiple elections in the same block. If more than one election change the validator set, only one of them is applied.

* Problem: Tendermint change to store validator changes at height h+2 will break `Election.get_status`.

* Solution: Reworked `get_validator_change` to look at only the latest block height or less.

2018-09-17 13:59:57 +02:00

..

test_migration_election.py

Create migration election class (#2535).

2018-09-17 13:59:57 +02:00