[tor-relays] Metrics

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> So you don't have to dig through the logs:
> (as root or sudo)
> ~# cat /var/lib/tor/pt_state/obfs4_bridgeline.txt
> ~# cat /var/lib/tor/fingerprint
> 
> or with multiple instances:
> ~# cat /var/lib/tor-instances/NN/pt_state/obfs4_bridgeline.txt
Or when running obfs4 in docker:
docker exec `docker ps -aqf "name=obfs4"` get-bridge-line