ProposeRequestVote on sigterm #7402
Description
etcd has some logic that a sigterm'd leader should quickly transfer leadership before it terminates.
So they send an equivalent of CCF's ProposeRequestVote to another node which can then become the new leader.
We should probably have something similar.
(we could possibly go further and have a leader directly hand over its leadership to a node which has the same ledger, similarly to how lock-based protocols do but this is much more tenuous)