[tor-relays] Uptime missing from Arm

[Damian Johnson]

> arm does not show uptime and the average bandwidth rate is way to high.

This is because tor changed the format of its state file since arm's
last release, causing the prepopulated values to be inaccurate. The
current codebase (nyx) uses a new capability of tor's control port to
provide much better graph prepopulation as you already observed.