add an option on gaiad.toml to stop a node at n block height

[1xCL]

Summary

This is a proposal to add an option on gaiad.toml to stop a node at n block height. Something like stop_gaiad_at = "" stop_gaiad_at = "450000"

Problem Definition

This would be an interesting feature when we upgrade the network at a certain block height. We could coordinate and stop the network at the exact block height and resolve misunderstandings that might come up when the network is still going even though the network is upgraded to newer version.

Proposal

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[alexanderbez]

Interesting proposal. Yeah this could be passed to the BaseApp constructor as an option function.

[ebuchman]

Nice idea. Proposed something similar here: https://github.com/tendermint/tendermint/blob/develop/docs/architecture/adr-016-protocol-versions.md#future-changes