Onion Circuits should support multiple Tor daemon instances

A Debian user noted that it would be nice to be able to view the circuits from the Tor daemon
run by the Tor Browser in addition to the system Tor daemon.

See Debian bug #817087 (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=817087).

Original created by @sst on 11223 (Redmine)

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