[tor-relays] Uptime missing from Arm

[Damian Johnson]

> Does it use `ps -o etime`? If so it should work in the latest OpenBSD
> release.

Yup, I use...

ps -p <pid> -o etime

Glad to hear it should now work on OpenBSD! To confirm would you mind
providing me the output of that command for some arbitrary process on
your OpenBSD system? I can add that to our unit tests just to be sure
things are happy.