Reset db for Ephemery Network

[gconnect]

Description

Ephemery network have a reset period. As a node runner/validator, I want my db to be automatically deleted and the update to happen automatically without manually restarting and deleting the old db.

Expected behavior

DB should be automatically deleted when update is due
When an update is due config should be updated automatically without manually stopping and restarting
Update check should happen on running node and not just on start

Actual behavior

Manual delete of db
Check for update only happens on start.

[gconnect]

@macfarla and @jflo please assign this issue to me

[jflo]

This one will sounds scary to users, we should make sure this has an "opt-in" behavior via CLI args.