consensus with very few running routers

when a majority of the authorities upgrade/restart just when it's time to vote then they will builds votes with only themselves marked as running.

This causes consensus documents with only very few, if any routers marked as running. In such cases it'd probably smarter to continue using an old consensus.

Maybe the solution is to not vote when you have only been running for a few (5 to 20?) minutes.

[Automatically added by flyspray2trac: Operating System: All]