[tor-relays] Uptime missing from Arm

[Damian Johnson]

> From MilkyWay:
> [root at clutterbuck ~]# ps -p 23780 -o etime
>     ELAPSED
> 78-14:14:25
>
> Hope that helps.

Thanks Alan. All of those are indeed what Stem expects. If you run the
Nyx codebase instead does the uptime show up? Please note you'll need
to fetch both it and stem from the git repos...

git clone https://git.torproject.org/nyx.git
git clone https://git.torproject.org/stem.git