Consensus can get stuck in PREPARE phase

[omerfirmak]

Some nodes fail to commit to a Ballot and we get stuck in PREPARE phase forever. A system wide restart generally unsticks the network.

[hewison-chris]

This could be solved by #3086

[omerfirmak]

I will give increasing timeouts a chance. Default implementation returns roundNumber.seconds so we mostly hit the timeout in the first couple of rounds and starting completely over. I am hoping that this would help both with our slow consensus and getting stuck problem.

        milliseconds computeTimeout(uint32_t roundNumber);  // Slot in the vtable

[hewison-chris]

But at some point we will still need to timeout and make progress after some kind of automatic reset.
So I think maybe both are needed.

[Geod24]

Should be fixed by #3111