Unexpected Epoch Change When All Nodes Down

[AurevoirXavier]

Due to #244, we've to stop all the validator(eleted) nodes and restart them in native mode. But Unexpected Epoch Change happended when all nodes down.

According to paritytech/substrate#4464, hard spoon is the only option to recover the chain.

[AurevoirXavier]

Try to make a time wrap to roll back to:

best: #319407 (0x4279…d04e), finalized #315395 (0x2b4c…1b82)

[AurevoirXavier]

Hard to make a patch.

Too many deps from substrate, we need to add them to our project.

Something like this:

    = note: expected struct `_::_parity_scale_codec::alloc::vec::Vec<(substrate_consensus_babe_primitives::app::Public, _)>` (struct `substrate_consensus_babe_primitives::app::Public`)
               found struct `_::_parity_scale_codec::alloc::vec::Vec<(substrate_consensus_babe_primitives::app::Public, _)>` (struct `substrate_consensus_babe_primitives::app::Public`)
    = note: perhaps two different versions of crate `substrate_consensus_babe_primitives` are being used?

[AurevoirXavier]

BABE bypass done, ce4ce7a.