cli: expose timeuntilstoredead

[jseldess]

Currently, timeuntilstoredead is only an env variable. Based on a chat with @bdarnell, it'd be good to eventually expose this more, ideally as some sort of global configuration for the cluster instead of a flag that needs to be specified on each node. Ben suggested we could easily make it something settable with a new command similar to cockroach zone set.

[dianasaur323]

Will this fit into the systems table that @dt is working on? Assigning to @dt for now for his thoughts on if this can make it into 1.0. If not, please put into Q3 2017 milestone.

[dt]

I don't know what timeuntilstoredead is, but there's a description of the settings table and what it is intended for here: https://github.com/cockroachdb/cockroach/blob/master/docs/RFCS/settings_table.md

[dt]

but yes, generally env vars are candidates for switching to system.settings

[bdarnell]

It's here and would definitely be good to move to the settings table.

[BramGruneir]

I agree, I think it's a perfect candidate.
Also failedReservationsTimeout and declinedReservationsTimeout which are from the store pool. Might be worth renaming them too.

[petermattis]

@BramGruneir It should be very easy to get settings added for these. Can you get this done today?

[BramGruneir]

Yep, already working on it.