Check compatibility of nodeos config before the node starts

[coachbjork]

With the recent updates of Antelope, there has been new configuration changes that require X to be more than Y at upstart. And some older configuration options that has been removed.

It would be beneficial for node operators if settings were validated first during a startup instead of after loading the chainbase. Since that can take a lot of time if the state is big.

Another beneficial function would be to add a flag to validate the config file that Node operators could use before they start/restart a node. That way you can ensure the config will work before you try to restart a node during software updates or configuration changes.

[bhazzard]

Good idea. Thank you for submitting.